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638 results on '"Barsella A"'

151. Multilongitudinal mode rate equation model for diode lasers

Author

Yousefi, M., Barsella, A., Lenstra, D., Morthier, G., Baets, R.G.F., McMurtry, S., Vilcot, J.-P., Osinski, M., Amano, H., Blood, P., Electro-Optical Communication, and Photonic Integration

Subjects
Physics, business.industry, Mode (statistics), Physics::Optics, Rate equation, Laser, law.invention, Semiconductor laser theory, Semiconductor, Optics, Laser diode rate equations, law, Optoelectronics, business, Diode
Abstract

A novel multi-longitudinal-mode rate-equations description of the Fabry-Perot type semiconductor laser is presented. The model includes gain dynamics among the longitudinal modes due to e.g. spatial hole burning.

Published
2003
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152. Improvement of the quadratic non-linear optical properties of pyrimidine chromophores by N-methylation and tungsten pentacarbonyl complexation

Author

Xiaoyang Che, Filip Bureš, Jean-Yves Saillard, Julien Vallet, Alberto Barsella, Sylvain Achelle, Bertrand Caro, Samia Kahlal, Françoise Robin-le Guen, Institut des Sciences Chimiques de Rennes (ISCR), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institute of Organic Chemistry and Technology, University of Pardubice, Faculty of Chemical Technology, Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institute of Organic Chemistry and Technology [University of Pardubice], University of Pardubice, Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Pyrimidine, Chemistry, Process Chemistry and Technology, General Chemical Engineering, chemistry.chemical_element, Second-harmonic generation, Nonlinear optics, N methylation, Chromophore, Tungsten, Ring (chemistry), Photochemistry, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Nonlinear system, chemistry.chemical_compound, Computational chemistry
Abstract

International audience; In this contribution, we report the synthesis of two series of compds.: 4-​(arylvinyl)​-​1-​methylpyrimidinium derivs. and tungsten pentacarbonyl complexes of 4-​(arylvinyl)​pyrimidines. Their second order non-​linear properties, measured by Elec.-​Field Induced Second Harmonic generation (EFISH) method, and their photophys. behavior were thoroughly investigated and compared to the corresponding 4-​(arylvinyl)​pyrimidines. A strong enhancement of the NLO response was obsd. upon methylation or complexation by W(CO)​5 of the pyrimidine ring. DFT theor. calcns. were performed to provide complementary insights on the structure-​properties relationships in particular concerning the amplitude of the NLO response.

Published
2015
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153. Light induced self-written waveguides interactions in photopolymer media

Author

Ben Belgacem, M. (Mohamed), Kamoun, S. (Saber), Gargouri, M. (Mohamed), Dorkenoo, K. (Kokou) D. (D), Barsella, A. (Alberto), and Mager, L. (Loic)

Subjects
Physics::Optics
Abstract

We present experimental and theoretical study of the interaction of Light Induced Self-Written (LISW) waveguides in photopolymers. We show that the diffusion of the monomer controls the refractive index distribution. Consequently it influences the interaction between the LISW channels allowing the observation of anti-crossing behavior or the propagation of an array of non interacting LISW waveguides.

Published
2015

154. Donor-linker-acceptor (D-π-A) diazine chromophores with extended π-conjugated cores: synthesis, photophysical and second order nonlinear optical properties

Author

Sylvain Achelle, Françoise Robin-le Guen, Bertrand Caro, Alberto Barsella, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)

Subjects
Diazine, 010405 organic chemistry, General Chemical Engineering, Solvatochromism, Sonogashira coupling, General Chemistry, Chromophore, Conjugated system, 010402 general chemistry, Photochemistry, 01 natural sciences, Acceptor, 0104 chemical sciences, chemistry.chemical_compound, Quinoxaline, chemistry, Intramolecular force, [CHIM]Chemical Sciences
Abstract

The synthesis of a series of push–pull pyrimidine and quinoxaline chromophores with extended π-conjugated cores is reported. Starting from a bromoarylvinyldiazine derivative, the key step in the preparation of the chromophores consists of a Sonogashira cross-coupling reaction. The photophysical properties of the compounds are described. A strong positive emission solvatochromism, typical for dyes presenting Intramolecular Charge Transfer (ICT), is observed, in particular for amino substituted derivatives with larger solvatochromic range than known analogous chromophores with smaller π-conjugated cores. The second order non linear optical (NLO) properties were investigated for some of the compounds and a comparison with the NLO responses of already described diazine chromophores exhibits a significant enhancement of the NLO properties by extension of the π-conjugated core.

Published
2015
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155. Chaotic lag synchronization and pulse-induced transient chaos in lasers coupled by saturable absorber

Author

Catherine Lepers and Alberto Barsella

Subjects
Physics, business.industry, Synchronization of chaos, Chaotic, Nonlinear optics, Saturable absorption, Optical chaos, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Pulse (physics), Coupling (physics), Optics, Transient (oscillation), Electrical and Electronic Engineering, Physical and Theoretical Chemistry, business
Abstract

Two lasers coupled via a common intracavity SF 6 saturable absorber show a cooperative coupling effect, instead of the most common competitive coupling. The dynamics of the system is very rich and includes strong pulsing, which may localize the non-linear interaction in time. Two chaotic regimes are analyzed experimentally and numerically: a chaotic lag synchronization resulting from an almost continuous interaction and a transient chaos resulting from a pulsed interaction.

Published
2002
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156. Concise Multigram-Scale Synthesis of Push-Pull Tricyanofuran-Based Hemicyanines with Giant Second-Order Nonlinearity: An Alternative for Electro-optic Materials

Author

Chantal Andraud, Olivier Maury, Alberto Barsella, Yann Bretonnière, J.P. Vola, Evelyne Chastaing, Françoise Soyer, Pierre Le Barny, Jean-Christophe Mulatier, Laurent Divay, Wissam Bentoumi, Pierre-Antoine Bouit, Laboratoire de Chimie - UMR5182 (LC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Thales Research and Technologies [Orsay] (TRT), THALES, École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and THALES [France]

Subjects
Tricyanofuran, Scale (ratio), business.industry, Chemistry, Organic Chemistry, Nonlinear optics, General Chemistry, Catalysis, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Nonlinear system, Figure of merit, Optoelectronics, business, Push pull, ComputingMilieux_MISCELLANEOUS
Abstract

Highly stable and highly soluble push-pull heptamethine hemicyanines based on the tricyanofuran electron-accepting group can be prepared on a 15 g scale. The compounds display giant second-order nonlinear figure of merit, μβ of up to 31,000×10(-48) esu, and lead to a poled material with a second-order nonlinear response, r33 of 90 pm V(-1) at 1.06 μm.

Published
2014
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157. Far-ultraviolet extinction and diffuse interstellar bands

Author

A. Megier, Bruno Barsella, Santi Aiello, S. Casu, and Jacek Krełowski

Subjects
Physics, Wavelength, Extinction curve, Diffuse interstellar band, Space and Planetary Science, Far ultraviolet, Extinction (astronomy), Astronomy, Astronomy and Astrophysics, Astrophysics::Galaxy Astrophysics
Abstract

We relate the equivalent widths of the major diffuse interstellar bands (DIBs) near 5797 and 5780 A with different colour excesses, normalized by E(B−V), which characterize the growth of interstellar extinction in different wavelength ranges. It is demonstrated that the two DIBs correlate best with different parts of the extinction curve, and the ratio of these diffuse bands is best correlated with the far-ultraviolet (UV) rise. A number of peculiar lines of sight are also found, indicating that the carriers of some DIBs and the far-UV extinction can be separated in certain environments, e.g. towards the Per OB2 association.

Published
2001
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158. Structural and thermal constraints to the tectonic evolution of foredeep successions in the Northern Apennines (Italy)

Author

BOTTI F, ALDEGA L, BARSELLA M, MARRONI M, MENEGHINI F, PALANDRI S. PANDOLFI L., CORRADO, Sveva, AA, Botti, F, Aldega, L, Barsella, M, Corrado, Sveva, Marroni, M, Meneghini, F, and Palandri, S. PANDOLFI L.

Abstract

A multi-method investigation (structural analysis, organic matter thermal maturity and clay mineralogy) was carried out on highly deformed foredeep successions in the Northern Apennine with special regard to shear zones in the Lago Trasimeno area (Rentella Unit) to unravel the main structural mechanisms and the thermal condition of the Miocene accretionary processes of the Northern Apennines belt. The Rentella Unit consists of a foredeep succession deposited in a paleogeographic domain between the Tuscan and the Umbria-Marche Domains. Meso- and microstructural data indicate shear planes compatible with C-planes (N160°, 45°SW). C-planes veins show dilational jogs and a staircase shape coherent to a top-to-the-NE sense of shear. Type II calcite twins in the shear zone associated veins suggest temperatures of 150-200°C. Temperature-dependent clay minerals and vitrinite reflectance indicate lower maximum paleo-temperatures (

Published
2008

159. Large Second-Order NLO Activity in Poly(4-vinylpyridine) Grafted with PdII and CuII Chromophoric Complexes with Tridentate Bent Ligands Containing Heterocycles

Author

Fabio Borbone, Principia Dardano, Pasqualino Maddalena, Ugo Caruso, Stefano Lettieri, Antonio Carella, Giuseppina Roviello, Alberto Barsella, Angela Tuzi, Borbone, Fabio, Carella, Antonio, Caruso, Ugo, Roviello, Giuseppina, Tuzi, Angela, Dardano, Principia, Lettieri, S., Maddalena, Pasqualino, and Barsella, A.

Subjects
chemistry.chemical_classification, Stereochemistry, Ligand, Bent molecular geometry, chemistry.chemical_element, Polymer, Copper, Inorganic Chemistry, Metal, chemistry.chemical_compound, chemistry, visual_art, Polymer chemistry, Pyridine, Acentric factor, visual_art.visual_art_medium, Palladium
Abstract

Two N-salicylidene-N'-acylhydrazines tridentate ligands containing heterocycles were prepared and utilized for the synthesis of mononuclear acentric complexes of Cu-II and Pd-II and pyridine serves as an additional ligand ((MLPy)-Py-x, M = metal, L-x = ligand). Characterization also includes single-crystal X-ray diffraction analysis. These complexes show high second-order nonlinear optical activity (mu beta = 620 x 10(-48)esu for both (CuLPy)-Py-II and (PdLPy)-Py-II and mu beta = 1600 x 10(-48) and 1400 x 10(-48) esu for (CuLPy)-Py-I and (PdLPy)-Py-I, respectively, at incident wavelength of 1907 nm). The properties of polymers (PMLx) obtained by grafting poly(4-vinyl-pyridine) with fragments of the complexes are also reported. The polymers exhibit good thermal stability, high glass-transition temperatures and the absence of crystallinity. The second-order nonlinear optical (NLO) properties of thin, transparent poled films, prepared by spin coating and thermal corona poling, were investigated for some of the polymers. The value of the d(33) parameter was measured at 1064 and 1500 nm (i.e., with and without resonance contribute). In the latter case, the d33 values are 21 and 12 pm/V for PCuLII and PPdLII, respectively. A high time stability of the NLO properties of these materials was found.

Published
2008

160. Transverse wave number selection and propagation of 2D-pulses in lasers with saturable absorber

Author

Catherine Lepers, Majid Taki, and Alberto Barsella

Subjects
Physics, Structure formation, business.industry, Transverse wave number, Nonlinear optics, Saturable absorption, Laser, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, law.invention, Transverse plane, Wavelength, Optics, law, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, business, Reduction (mathematics)
Abstract

Selection of transverse patterns in laser systems with an intra-cavity saturable absorber is shown to be tuned by the absorber. The wavelength of the selected pattern is theoretically predicted, and the prediction is in a good agreement with the results of the numerical solutions of the governing equations for a 2-level laser model. An interesting feature is that the presence of a saturable absorber leads to the formation of transverse patterns in regimes where the free-running laser exhibits only a stable homogeneous state, via a frequency-pulling phenomenon. A surprising threshold reduction effect may also be observed in this case. We also show that when the absorber inhibits structure formation, transverse propagating pulses may appear.

Published
2000
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161. Crosslinkable organic glasses with quadratic nonlinear optical activity

Author

Alberto Barsella, Roberto Centore, Antonio Carella, Loic Mager, Alain Fort, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Masson, Beatrice, Carella, Antonio, Centore, Roberto, L., Mager, A., Barsella, and A., Fort

Subjects
Organic electronics, Benzimidazole, 010405 organic chemistry, Second-harmonic generation, Nonlinear optics, General Chemistry, Chromophore, 010402 general chemistry, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, Electronic, Optical and Magnetic Materials, Biomaterials, chemistry.chemical_compound, chemistry, Polymerization, Thermal, Materials Chemistry, Organic chemistry, Physical chemistry, Electrical and Electronic Engineering, Thin film
Abstract

In this paper, the use of a pure benzimidazole based dimethacrylic push–pull chromophore has been investigated for the preparation of thin films exhibiting quadratic nonlinear optical (NLO) properties. To stabilize these NLO properties, the chromophore orientation has been frozen in a noncentrosymmetric arrangement by cross-linking the material using thermal polymerization induced by suitable initiators. The films present a very stable quadratic optical activity up to T = 152 °C with SHG coefficient d 33 of 14 pm/V measured at 1.9 μm.

Published
2007

164. Synchronization of two strongly pulsating CO2 lasers

Author

Pierre Glorieux, Thomas Erneux, Alberto Barsella, Catherine Lepers, and Didier Dangoisse

Subjects
Physics, Co2 laser, business.industry, Saturable absorption, Laser, Q-switching, Atomic and Molecular Physics, and Optics, Synchronization, Electronic, Optical and Magnetic Materials, law.invention, Nonlinear system, Coupling (physics), Amplitude, Optics, law, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, business
Abstract

The response of two CO 2 lasers sharing a common saturable absorber when both lasers are strongly pulsating was studied. Both of the lasers behave as strongly nonlinear limit-cycle oscillators exhibiting different amplitudes but similar periods. Since coupling through the saturable absorber is highly nonlinear, communication between lasers occurs only during short periods of time and when they are pulsating at about the same time. Nevertheless, we show experimentally and numerically that in-phase and out-of-phase oscillations are possible modes of synchronization.

Published
1999
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165. Work in Boccaccio's 'Decameron': Politics, theology, and the images of the countryside

Author

Barsella, Susanna

Subjects
Decameron (Novel) -- Criticism and interpretation, International relations, News, opinion and commentary
Abstract

An exploration of the economic setting and the theme of work in Boccaccio's 'Decameron', which illuminates the intellectual profile of Boccaccio the humanist, are presented.

Published
2007

168. Proaromatic pyranylidene chalcogen analogues and cyclopenta[ c ]thiophen-4,6-dione as electron donors and acceptor in efficient charge-transfer chromophores

Author

Solanke, Parmeshwar, primary, Achelle, Sylvain, additional, Cabon, Nolwenn, additional, Pytela, Oldřich, additional, Barsella, Alberto, additional, Caro, Bertrand, additional, Robin-le Guen, Françoise, additional, Podlesný, Jan, additional, Klikar, Milan, additional, and Bureš, Filip, additional

Published
2016
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169. Swift-Hohenberg model of a laser with saturable absorber

Author

Alberto Barsella, Majid Taki, C. Lepers, and P. Glorieux

Subjects
Physics, Physics and Astronomy (miscellaneous), Field (physics), business.industry, Saturable absorption, Laser, Atomic and Molecular Physics, and Optics, law.invention, Nonlinear system, Transverse plane, Optics, law, Ordinary differential equation, Quantum electrodynamics, business, Nonlinear Sciences::Pattern Formation and Solitons
Abstract

The spatiotemporal dynamics of the bifurcating transverse modes of a laser with saturable absorber is demonstrated to be governed by a complex Swift-Hohenberg equation for the laser field coupled to an ordinary differential equation. Numerical investigations are reported to illustrate the nonlinear spatiotemporal evolution near and beyond threshold.

Published
1999
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170. ChemInform Abstract: Methylenepyran Based Dipolar and Quadrupolar Dyes: Synthesis, Electrochemical and Photochemical Properties

Author

Françoise Robin-le Guen, Nikolay Vologdin, Alberto Barsella, B. Caro, Sylvain Achelle, and Sébastien Gauthier

Subjects
chemistry.chemical_compound, Dipole, Nonlinear optical, chemistry, Bistability, Dimer, General Medicine, Cyclic voltammetry, Photochemistry, Electrochemistry, Fluorescence, Redox
Abstract

This paper presents the synthesis of a series of push–pull and quadrupolar π-conjugated structures incorporating pro-aromatic methylenepyran electron-donor groups and various electron-attracting groups. Some of the methylenepyran derivatives were oxidized by I 2 to give, after reduction by Na 2 S 2 O 3 , bismethylenepyran compounds via successive steps. The electrochemical redox properties of methylenepyrans 5 – 9 and extended bismethylenepyrans 10 , 14 , and 15 determined by cyclic voltammetry indicate the formation of redox bistable systems with high bi-stability. Oxidation of the dimers obtained from 5 to 9 was also described. All compounds are colored and slightly fluorescent (except some bismethylenepyran derivatives). Some compound second-order nonlinear optical properties were investigated, and large positive values of μβ were obtained. A positive dimer effect was also observed for bispyran derivatives.

Published
2014
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171. Photophysical, amplified spontaneous emission and charge transport properties of oligofluorene derivatives in thin films

Author

Cyrille Monnereau, Loic Mager, Daisuke Hashizume, Delphine Pitrat, Aiko Nakao, Fabrice Mathevet, Alberto Barsella, E. Y. Choi, Leszek Mateusz Mazur, André Jean Attias, Ji Eon Kwon, Dong-Wook Kim, Yiming Xiao, Katarzyna Matczyszyn, Kokou D. Dorkenoo, Jean-Charles Ribierre, Minji Gwon, Benoît Heinrich, Soo Young Park, T. Aoyama, J. W. Wu, Masanobu Uchiyama, Jean-Christophe Mulatier, Chantal Andraud, A. Fort, Marek Samoc, Chimie des polymères (LCP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut Parisien de Chimie Moléculaire (IPCM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institute of Physical and Theoretical Chemistry, Wroclaw University of Science and Technology, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), RIKEN - Institute of Physical and Chemical Research [Japon] (RIKEN), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut Parisien de Chimie Moléculaire (IPCM), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Université de Strasbourg (UNISTRA)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)

Subjects
Amplified spontaneous emission, Photoluminescence, Materials science, oligofluorene, business.industry, General Physics and Astronomy, Quantum yield, Fluorene, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, Photochemistry, chemistry.chemical_compound, chemistry, Optoelectronics, Charge carrier, Physical and Theoretical Chemistry, Thin film, business, Glass transition, HOMO/LUMO
Abstract

International audience; We investigate the photophysical and amplified spontaneous emission properties of a series of monodisperse solution-processable oligofluorenes functionalized with hexyl chains at the C9 position of each fluorene unit. Thin films of these oligofluorenes are then used in organic field-effect transistors and their charge transport properties are examined. We have particularly focused our attention on the influence of oligofluorene length on the absorption and steady-state fluorescence spectra, on the HOMO/LUMO energy levels, on the photoluminescence lifetime and quantum yield as well as on the amplified spontaneous emission properties and the charge carrier mobilities. Differential scanning calorimetry and X-ray diffraction measurements demonstrate that, among all oligofluorene derivatives used in this study, only the structure and morphology of the pentafluorene film is significantly modified by a thermal treatment above the glass transition temperature, resulting in a 9 nm blue-shift of the fluorescence spectrum without significant changes in the photoluminescence quantum yield and in the amplified spontaneous emission threshold. In parallel, hole field-effect mobility is significantly increased from 8.6 × 10(-7) to 3.8 × 10(-5) cm(2) V(-1) s(-1) upon thermal treatment, due to an increase of crystallinity. This study provides useful insights into the morphological control of oligofluorene thin films and how it affects their photophysical and charge transport properties. Moreover, we provide evidence that, because of the low threshold, the tunability of the amplified spontaneous emission and the photostability of the films, these oligofluorenes are promising candidates for organic solid-state laser applications.

Published
2014
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172. Role of the acceptor in tuning the properties of metal [M(II) = Ni, Pd, Pt] dithiolato/dithione (donor/acceptor) second-order nonlinear chromophores: Combined experimental and theoretical studies

Author

Espa, D. Pilia, L. Makedonas, C. Marchiò, L. Mercuri, M.L. Serpe, A. Barsella, A. Fort, A. Mitsopoulou, C.A. Deplano, P.

Abstract

The mixed-ligand complexes [M(II)(Et2dazdt)(mnt)] (M = Ni, 1; Pd, 2; Pt, 3) [Et2dazdt = N,N′-diethyl-perhydrodiazepine-2,3- dithione; mnt = maleonitrile-2,3-dithiolate] have been prepared and fully characterized. X-ray diffractometric studies on 1-3 (the structure of 1 was already known) show that the crystals are isostructural (triclinic, P-1), and two independent molecular entities are present in the unit cell. These entities differ in the orientation of the ethyl substituents with respect to the epta-atomic ring. In the C2S2MS2C2 dithiolene core the four sulfur atoms define a square-planar coordination environment of the metal where the M-S bond distances involving the two ligands are similar, while the C-S bond distances in the C2S2 units exhibit a significant difference in Et2dazdt (dithione) and mnt (dithiolato) ligands. 1-3 show in the visible region one or two moderately strong absorption peaks, having ligand-to-ligand charge-transfer (CT) character with some contribution of the metal, and show negative solvatochromism and molecular quadratic optical nonlinearity, which was determined by the EFISH (electric-field-induced second-harmonic generation) technique. These complexes are redox active and show two reversible reduction waves and one irreversible oxidation wave. Theoretical calculations based on DFT and TD-DFT calculations on complexes 1-3 as well as on [Pt(Bz2pipdt)(mnt)] (4) and [Pt(Bz 2pipdt)(dmit)] (5) highlight the factors which affect the optical properties of these second-order redox-active NLO chromophores. Actually, the torsion angle of the dithione system (δ2) inversely correlates either with the oscillator strengths of the main transition of the complexes or with their beta values. The high beta value of 5 can be attributed both to its lowest torsion angles and to the extent of the π system of its dithiolate ligand, dmit. © 2014 American Chemical Society.

Published
2014

174. N, N '-Dibutylbarbituric acid as an acceptor moiety in push-pull chromophores

Author

Tomáš Mikysek, Oldřich Pytela, Milan Klikar, Kokou D. Dorkenoo, Filip Bureš, Zdeňka Padělková, Alberto Barsella, and Sylvain Achelle

Subjects
Absorption spectroscopy, 010405 organic chemistry, Chemistry, Aucun, General Chemistry, Chromophore, 010402 general chemistry, Photochemistry, Electrochemistry, 01 natural sciences, Acceptor, Catalysis, 0104 chemical sciences, Nonlinear optical, Intramolecular force, Materials Chemistry, Moiety, Push pull
Abstract

Twelve novel D-pi-A chromophores with the N, N'-dibutylbarbituric acid acceptor, the N, N-dimethylamino donor and a systematically extended pi-linker were synthesized. The extent of intramolecular charge-transfer, structure-property relationships and nonlinear optical properties were further investigated by X-ray analysis, electrochemistry, UV/Vis absorption spectra, calculations and EFISH experiments.

Published
2013

175. N,N0-Dibutylbarbituric acid as an acceptor moiety in push-pull chromophores

Author

Klikar, Milan, Bureš, Filip, Pytela, Oldřich, Mikysek, Tomas, Padelkova, Zdenka, Barsella, A., Dorkenoo, Kokou, Achelle, Sylvain, Institute of Organic Chemistry and Technology [University of Pardubice], University of Pardubice, Department of Analytical Chemistry, Department of General and Inorganic Chemistry [University of Pardubice], Faculty of Chemical Technology [University of Pardubice], University of Pardubice-University of Pardubice, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), This work was supported by the Czech Science Foundation (13-01061S) and Technology Agency of the Czech Republic (TE01020022, Flexprint)., Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institute of Organic Chemistry and Technology, University of Pardubice, Faculty of Chemical Technology, Department of General and Inorganic Chemistry, University of Pardubice, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS)

Subjects
[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry
Abstract

International audience; Twelve novel D-p-A chromophores with the N,N0-dibutylbarbituric acid acceptor, the N,N-dimethylamino donor and a systematically extended p-linker were synthesized. The extent of intramolecular charge-transfer, structure-property relationships and nonlinear optical properties were further investigated by X-ray analysis, electrochemistry, UV/Vis absorption spectra, calculations and EFISH experiments.

Published
2013
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176. Synthesis, photophysics and nonlinear optical properties of stilbenoid pyrimidine-based dyes bearing methylenepyran donor groups

Author

Huriye Akdas-Kilig, Françoise Robin-le Guen, Stéphane Aloïse, Jean-Luc Fillaut, Jean-Pierre Malval, Alberto Barsella, Bertrand Caro, Sylvain Achelle, Loic Mager, Arnaud Spangenberg, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut de Science des Matériaux de Mulhouse (IS2M), Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement - UMR 8516 (LASIRE), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Centrale Lille Institut (CLIL), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut de Chimie du CNRS (INC)-Université de Lille-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique

Subjects
Exciton, Molecular Conformation, Electron, 010402 general chemistry, Photochemistry, Branching (polymer chemistry), 01 natural sciences, chromophores, Physical and Theoretical Chemistry, Fluorescent Dyes, Pyrans, photophysics, heterocycles, 010405 organic chemistry, Chemistry, nonlinear optics, Nonlinear optics, Chromophore, Atomic and Molecular Physics, and Optics, Planarity testing, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, Kinetics, Dipole, Nonlinear system, Pyrimidines, Quantum Theory, Spectrophotometry, Ultraviolet, conjugation
Abstract

International audience; The nonlinear properties and the photophysical behavior of two π-conjugated chromophores that incorporate an electron-deficient pyrimidine core (A) and γ-methylenepyrans as terminal donor (D) groups have been thoroughly investigated. Both dipolar and quadrupolar branching strategies are explored and rationalized on the basis of the Frenkel exciton model. Even though a cooperative effect is clearly observed if the dimensionality is increased, the nonlinear optical (NLO) response of this series is moderate if one considers the nature of the D/A couple and the size of the chromophores (as measured by the number of π electrons). This effect was attributed to a disruption in the electronic conjugation within the dyes' scaffold for which the geometry deviates from planarity owing to a noticeable twisting of the pyranylidene end-groups. This latter structural parameter also has a strong influence on the excited-state dynamics, which leads to a very efficient fluorescence quenching.

Published
2013
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177. Methylenepyran based dipolar and quadrupolar dyes: synthesis, electrochemical and photochemical properties

Author

B. Caro, Françoise Robin-le Guen, Sylvain Achelle, Alberto Barsella, Nikolay Vologdin, Sébastien Gauthier, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes-Centre National de la Recherche Scientifique (CNRS)

Subjects
Bistability, 010405 organic chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Dimer, Organic Chemistry, Nonlinear optics, 010402 general chemistry, Photochemistry, Electrochemistry, 01 natural sciences, Biochemistry, Fluorescence, Redox, 0104 chemical sciences, [CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry, chemistry.chemical_compound, Dipole, chemistry, Drug Discovery, Cyclic voltammetry
Abstract

This paper presents the synthesis of a series of push–pull and quadrupolar π-conjugated structures incorporating pro-aromatic methylenepyran electron-donor groups and various electron-attracting groups. Some of the methylenepyran derivatives were oxidized by I 2 to give, after reduction by Na 2 S 2 O 3 , bismethylenepyran compounds via successive steps. The electrochemical redox properties of methylenepyrans 5 – 9 and extended bismethylenepyrans 10 , 14 , and 15 determined by cyclic voltammetry indicate the formation of redox bistable systems with high bi-stability. Oxidation of the dimers obtained from 5 to 9 was also described. All compounds are colored and slightly fluorescent (except some bismethylenepyran derivatives). Some compound second-order nonlinear optical properties were investigated, and large positive values of μβ were obtained. A positive dimer effect was also observed for bispyran derivatives.

Published
2013
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180. Stress birefringence patterning in photopolymer induced by structured illumination

Author

Loic Mager, Christiane Carre, Kokou D. Dorkenoo, Jean-Philippe Bombenger, Alberto Barsella, Gregory Taupier, Groupe d'Optique Non Linéaire et d'Optoélectronique, Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Département de Photochimie Générale (DPG), Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS), Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Centre National de la Recherche Scientifique (CNRS)-Télécom Bretagne, Université de Rennes (UR)-Université européenne de Bretagne - European University of Brittany (UEB)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne-Centre National de la Recherche Scientifique (CNRS)

Subjects
Diffraction, Materials science, Polarimetry, (050.1940) Diffraction and gratings: Diffraction, (160.4890) Materials: Organic Material, (260.1440) Physical optics: Birefringence, (260.5430) Physical optics: Polarization, 02 engineering and technology, 01 natural sciences, 010309 optics, Inorganic Chemistry, Stress (mechanics), chemistry.chemical_compound, Optics, Polarization, 0103 physical sciences, Electrical and Electronic Engineering, Physical and Theoretical Chemistry, Spectroscopy, Shrinkage, Acrylate, Birefringence, business.industry, Organic Chemistry, [CHIM.MATE]Chemical Sciences/Material chemistry, 021001 nanoscience & nanotechnology, Polarization (waves), Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Organic Material, Photopolymer, chemistry, Optoelectronics, 0210 nano-technology, business
Abstract

4 pages; International audience; We report on the stress birefringence distribution induced by the photopatterning of a multifunctional crosslinkable acrylate monomer sensitized in the visible range. The patterning of this material, prepared in a glass cell of a few tens of microns thickness, is obtained through illumination in a two steps process. The first step is performed using an illumination pattern with a high contrast and a low spatial frequency. The second one is a uniform illumination. The discrepancies in the shrinkage experimented by the material leads to the apparition of patterned stress birefringence revealed through polarimetry and diffraction measurements.

Published
2013
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182. The regulatory role of Rv in the photochemistry of dark clouds

Author

Bruno Barsella, Santi Aiello, Costanza Cervetto, and Cesare Cecchi-Pestellini

Subjects
Physics, Space and Planetary Science, Scattering, Radiative transfer, Astronomy and Astrophysics, Penetration (firestop), Astrophysics, Radiation, Anisotropy, Astrophysics::Galaxy Astrophysics
Abstract

The penetration of UV radiation inside dark clouds is discussed; and detailed calculations of Rv-dependent photorates are described. Using an accurate method for solving radiative transfer in the presence of coherent anisotropic. non-conservative scattering by dust grains, the role of the parameter Rv as the main regulatory agent of the penetration of radiation inside clouds is evidenced. Local variations in optical properties of dust and their possible link with the evolution of the cloud are also discussed.

Published
1995
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183. Mapping UV radiation in dark clouds

Author

Bruno Barsella, Santi Aiello, and Cesare Cecchi-Pestellini

Subjects
Physics, Optics, Space and Planetary Science, business.industry, Radiative transfer, Astronomy, Astronomy and Astrophysics, Optical radiation, Radiation, business
Published
1995
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185. Sum-frequency generation in sol-gel material doped with binaphthol

Author

Michelangelo Romeo, Olivier Crégut, Alberto Barsella, Loic Mager, Kokou D. Dorkenoo, Gregory Taupier, Hicham Arhach, Alex Boeglin, Jean-Luc Rehspringer, and May Saad

Subjects
Sum-frequency generation, Frequency conversion, Materials science, Physics and Astronomy (miscellaneous), Optical materials, Doping, Aucun, Organic chemistry, Physical chemistry, Computer Science::Databases, Sol-gel
Abstract

A sum-frequency imaging system is used to investigate optical activity in a sol-gel material doped with the chiral molecule binaphthol. We show that this material can be optically structured to embed information that can be retrieved by sum-frequency.

Published
2012

186. Near infrared two-photon self-confinement in photopolymers for light induced self-written waveguides fabrication

Author

Honorat Dorkenoo, Loic Mager, and Alberto Barsella

Subjects
Fabrication, Materials science, Physics and Astronomy (miscellaneous), business.industry, Near-infrared spectroscopy, Single-mode optical fiber, Aucun, Physics::Optics, Finite element method, Optics, Photopolymer, Two-photon excitation microscopy, Light induced, Optoelectronics, business, Absorption (electromagnetic radiation)
Abstract

We present the fabrication of single mode light induced self-written waveguides using two-photon absorption in photopolymers. The measurements are compared to the finite element method simulation of the propagation and demonstrate that two-photon process leads to the confinement of light.

Published
2012

187. Synthesis and photophysical investigation of a series of push-pull arylvinyldiazine chromophores

Author

Alberto Barsella, Sylvain Achelle, Françoise Robin-le Guen, Christine Baudequin, Bertrand Caro, Institut des Sciences Chimiques de Rennes (ISCR), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)

Subjects
chemistry.chemical_classification, Photons, Luminescence, Vinyl Compounds, 010405 organic chemistry, Chemistry, Organic Chemistry, Solvatochromism, Chromophore, [CHIM.INOR]Chemical Sciences/Inorganic chemistry, 010402 general chemistry, Photochemistry, 01 natural sciences, Aldehyde, 0104 chemical sciences, Absorption, Pyrimidines, Molecule, Aldol condensation, Colorimetry, Spectrophotometry, Ultraviolet, Absorption (chemistry), Excitation
Abstract

International audience; A new series of push-pull arylvinyldiazines has been efficiently prepared by aldol condensation between the appropriate methyldiazine and aromatic aldehyde. The optical absorption and emission properties of these chromophores were studied in different solvents and media. These compounds act as polarity sensors with a strong positive emission solvatochromism. This behavior suggests a highly polar emitting state, which is characteristic of compounds that undergo an internal charge transfer upon excitation. These molecules also exhibit halochromic properties and are potential colorimetric and luminescence pH sensors. The second-order nonlinear properties have been investigated for some of the compounds, and large and positive μβ are obtained, in particular, for pyrimidine derivatives.

Published
2012
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188. Optical memories, method for reading and writing such optical memories, and device for reading and writing such memories

Author

Fort, A., Dorkenoo, Kokou D., Gindre, Denis, Barsella, Alberto, MOLTECH-Anjou, Université d'Angers (UA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Univ Angers, Okina

Subjects
[CHIM] Chemical Sciences, [CHIM]Chemical Sciences
Abstract

The invention concerns a optical data memory, said memory comprising at least one layer of supporting material, said supporting material including molecules having, in a local zone, a collective state of molecules from at least one first collective state of molecules, and a second collective state of molecules. The invention is characterized in that only molecules having the first collective state of molecules in said local zone are capable of generating a second-harmonic signal when they are excited in said local zone by a reading electromagnetic radiation., L'invention se rapporte à une mémoire optique de données, ladite mémoire comprenant au moins une couche (6A, 6B, 6C) d'un matériau support, ledit matériau support comprenant des molécules (2, 4) ayant, dans une zone locale (9), un état collectif de molécules parmi au moins un premier état collectif de molécules (4), et un deuxième état collectif de molécules (2), caractérisé en ce que seules des molécules ayant ledit premier état collectif de molécules (4) dans ladite zone locale (9) sont aptes à générer un signal de second harmonique lorsqu'elles sont excitées dans ladite zone locale par un rayonnement électromagnétique de lecture.

Published
2012

189. New Cross-Linkable Polymers with Huisgen Reaction Incorporating High μβ Chromophores for Second-Order Nonlinear Optical Applications

Author

Loic Mager, Yann Pellegrin, Yann Bretonnière, Virginie Silvestre, Wissam Bentoumi, Kokou D. Dorkenoo, Errol Blart, Clément Cabanetos, Chantal Andraud, Laurent Fontaine, Alberto Barsella, Fabrice Odobel, Véronique Montembault, Chimie Et Interdisciplinarité : Synthèse, Analyse, Modélisation (CEISAM), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie - UMR5182 (LC), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Unité de chimie organique moléculaire et macromoléculaire (UCO2M), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et Nanosciences Grand-Est (MNGE), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)-Institut de Chimie du CNRS (INC), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)-Matériaux et nanosciences d'Alsace (FMNGE), Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Réseau nanophotonique et optique, and Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)

Subjects
Materials science, General Chemical Engineering, Radical polymerization, 02 engineering and technology, Activation energy, Huisgen cycloaddition reaction, 010402 general chemistry, Photochemistry, 01 natural sciences, chemistry.chemical_compound, Polymer chemistry, Materials Chemistry, electro-optic, ComputingMilieux_MISCELLANEOUS, chemistry.chemical_classification, Poling, General Chemistry, Polymer, Chromophore, 021001 nanoscience & nanotechnology, Polyene, methacrylate polymer, radical polymerization, 0104 chemical sciences, [CHIM.POLY]Chemical Sciences/Polymers, chemistry, push-pull chromophore, second-order nonlinear optic, Polar effect, Surface modification, 0210 nano-technology, cross-linking
Abstract

We report herein the synthesis, the functionalization, and the successful radical polymerization of very nonlinear optical (NLO) active push–pull polyene chromophores (CPO). Second, the thermal Huisgen cyclo-addition cross-linking reaction was implemented, and it proved to be fully compatible with a polyene-based push–pull chromophore. Toward this goal, PMMA-co-CPO-3 and two cross-linkable polymers (PCC1-CPO-3 and PCC2-CPO-3) were first prepared and characterized by a modified Teng and Man technique performed in transmission. These first series of polymers were not compatible with the applied poling conditions because an irreversible film degradation was systematically observed at a temperature significantly lower than the cross-linking temperature. Consequently, a second series of polymers was prepared, in which the cross-linking temperature was decreased by functionalizing acetylenic moieties with ester electron withdrawing groups, which decrease the activation energy of the thermal Huisgen cyclo-additi...

Published
2012
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190. Dipolar NLO Chromophores Bearing Diazine Rings as π-Conjugated Linkers

Author

Klikar, Milan, le Poul, Pascal, Růžička, Aleš, Pytela, Oldřich, Barsella, Alberto, Dorkenoo, Kokou D., Robin-le Guen, Françoise, Bureš, Filip, and Achelle, Sylvain

Abstract

The synthesis of a series of push–pull derivatives bearing triphenylamine electron-donating group, cyclopenta[c]thiophen-4,6-dione electron acceptor and various π-linkers including (hetero)aromatic fragments is reported. All target chromophores with systematically varied π-linker structure were further investigated by electrochemistry, absorption measurements, and EFISH experiments in conjunction with DFT calculations. Based on electrochemical and photophysical measurements, when a polarizable 2,5-thienylene moiety is embedded into the chromophore π-backbone the highest intramolecular charge transfer (ICT) is observed. Benzene, pyrimidine, and pyridazine derivatives exhibit lower polarizability and extent of the ICT across these π-linkers. The elongation of the π-conjugated system via additional ethenylene linker results in a significant reduction of the HOMO–LUMO gap and an enhancement of the NLO response. Whereas it does not significantly influence electrochemical and linear optical properties, the orientation of the pyrimidine ring seems to be a key parameter on the μβvalue due to significant variation of the dipolar moment (μ) value. In 2aand 2c, pyrimidine is oriented to behave as an acceptor and thus generate dipolar molecule with μ above 5 D, whereas in 2band 2dground state dipole moment is significantly reduced. This study seems to indicate a high aromaticity of pyrimidine and pyridazine derivatives, close to the benzene analogues and significantly higher than thiophene analogues.

Published
2024
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191. Polarization state studies in second harmonic generation signals to trace atherosclerosis lesions

Author

Kokou D. Dorkenoo, Alberto Barsella, Hervé Bulou, Gregory Taupier, Pascal Bousquet, Loic Mager, Alex Boeglin, and Camille Doras

Subjects
Materials science, Second-harmonic imaging microscopy, Normal Distribution, Aucun, law.invention, Mice, Optics, Confocal microscopy, law, Microscopy, Collagen network, medicine, Image Processing, Computer-Assisted, Animals, Humans, Aorta, Scanning microscopy, Mice, Knockout, Microscopy, Confocal, Models, Statistical, business.industry, Second-harmonic generation, Arteries, Polarization (waves), Atherosclerosis, Atomic and Molecular Physics, and Optics, Elastin, Mice, Inbred C57BL, Disease Models, Animal, medicine.anatomical_structure, Collagen, Microscopy, Polarization, business, Artery
Abstract

We have performed multi-photon image reconstructions as well as polarization state analyses inside an artery wall affected by atherosclerosis to investigate the changes in collagen structure. Mice, either healthy or affected by spontaneous atherosclerosis, have been used for this purpose. A two-photon imaging system has been used to investigate atherosclerotic lesions in the ascending aorta of mice. Second harmonic imaging has been performed alternatively on healthy samples and on affected region. The reconstructed images show that the spatial distribution of the collagen network seems disorganized by the disease. The polarization state studies reveal however that the apparent disorganization of the collagen is related to its spatially diffuse distribution and that the internal structure of the collagen fibers is not affected by the disease. In addition, a theoretical simulation of the second harmonic polarization states shows that they are consistent with the known 3D structure of the collagen network.

Published
2011

192. Redox-switchable chromophores based on metal (Ni, Pd, Pt) mixed-ligand dithiolene complexes showing molecular second-order nonlinear-optical activity

Author

Alain Fort, Alberto Barsella, Neil Robertson, Luca Pilia, Davide Espa, Paola Deplano, Angela Serpe, Maria Laura Mercuri, Simon Dalgleish, and Luciano Marchiò

Subjects
Models, Molecular, Solvatochromism, chemistry.chemical_element, Hyperpolarizability, Chromophore, Photochemistry, Crystallography, X-Ray, Ligands, Inorganic Chemistry, Metal, Nickel, chemistry, visual_art, visual_art.visual_art_medium, Organometallic Compounds, Sulfhydryl Compounds, Physical and Theoretical Chemistry, Platinum, Oxidation-Reduction, Palladium, Group 2 organometallic chemistry
Abstract

The synthesis and full characterization of the redox-active nickel triad mixed-ligand dithiolene complexes based on Bz(2)pipdt = 1,4-dibenzylpiperazine-3,2-dithione and dmit = 2-thioxo-1,3-dithiole-4,5-dithiolate ligands are reported. These complexes show a reversibly bleacheable solvatochromic peak and a remarkably high negative molecular first hyperpolarizability, whose values depend on the metal being highest for the platinum(II) compound.

Published
2011

193. Combined experimental and theoretical study on redox-active d8 metal dithione-dithiolato complexes showing molecular second-order nonlinear optical activity

Author

Pilia, L. Espa, D. Barsella, A. Fort, A. Makedonas, C. Marchiò, L. Mercuri, M.L. Serpe, A. Mitsopoulou, C.A. Deplano, P.

Abstract

Synthesis, characterization, NLO properties, and theoretical studies of the mixed-ligand dithiolene complexes of the nickel triad [M(II)(Bz 2pipdt)(mnt)] (Bz2pipdt = 1,4-dibenzyl-piperazine-3,2- dithione, mnt = maleonitriledithiolato, M(II) = Ni, 1, Pd, 2, Pt, 3) are reported. Molecular structural characterization of 1-3 points out that four sulfur atoms are in a slightly distorted square-planar geometry. While the M-S bond distances are only slightly different, comparison of the C-C and C-S bonds in the C2S2MS2C2 core allows us to point out a significant difference between the C-C and the C-S distances in Bz2pipdt and mnt. These findings suggest assigning a dithiolato character to mnt (pull ligand) and a dithione one (push ligand) to Bz 2pipdt. Cyclic voltammetry of 1-3 exhibits two reversible reduction waves and a broad irreversible oxidation wave. These complexes are characterized in the visible region by a peak of moderately strong intensity, which undergoes negative solvatochromism. The molecular quadratic optical nonlinearities were determined by the EFISH technique, which provided the following values μβλ (10-48 esu) = -1436 (1), -1450 (2), and -1950 (3) converted in μβ0 (10-48 esu) = -463 (1), -684 (2), and -822 (3), showing that these complexes exhibit large negative second-order polarizabilities whose values depend on the metal, being highest for the Pt compound. DFT and TD-DFT calculations on 1-3 allow us to correlate geometries and electronic structures. Moreover, the first molecular hyperpolarizabilities have been calculated, and the results obtained support that the most appealing candidate as a second-order NLO chromophore is the platinum compound. This is due to (i) the most extensive mixture of the dithione/metal/dithiolato orbitals, (ii) the influence of the electric field of the solvent on the frontier orbitals that maximizes the difference in dipole moments between the excited and the ground state, and (iii) the largest oscillator strength in the platinum case vs nickel and palladium ones. © 2011 American Chemical Society.

Published
2011

194. Electronic energy and electron transfer processes in photoexcited donor–acceptor dyad and triad molecular systems based on triphenylene and perylene diimide units

Author

Lee, K. J., primary, Woo, J. H., additional, Kim, E., additional, Xiao, Y., additional, Su, X., additional, Mazur, L. M., additional, Attias, A.-J., additional, Fages, F., additional, Cregut, O., additional, Barsella, A., additional, Mathevet, F., additional, Mager, L., additional, Wu, J. W., additional, D'Aléo, A., additional, and Ribierre, J.-C., additional

Published
2016
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195. Electronic responses of donor acceptor substituted twisted biphenyls

Author

J. Rotzler, E. Ay, Alberto Barsella, H. Chaumeil, Alain Fort, Marcel Mayor, and Alex Boeglin

Subjects
symbols.namesake, Dipole, Computational chemistry, Oscillator strength, Chemistry, COSMO solvation model, Ab initio, symbols, Density functional theory, Electronic structure, Dihedral angle, Hamiltonian (quantum mechanics), Molecular physics
Abstract

Donor-acceptor biphenyl derivatives are particularly interesting model compounds presenting a charge transfer absorption band because the extent of conjugation, and therefore the amount of charge transfer between the substituents, may be varied by a controllable structural feature, namely the torsion angle between the two phenyl rings. This feature has become even more interesting since chromophores of strong zwitterionic character, synthesized with a twist of nearly 90°, have been shown to exhibit unprecedented quadratic responses [1], over an order of magnitude above that of the best conventional push-pull chromophores. In this context, we have investigated both experimentally and theoretically, two biphenyl based systems with varying inter-aryl angles: a nitro-piperidinyl series [2] of conventional push-pull character and a pyridinium-phenoxide series [3] of zwitterionic character. The results agree qualitatively with semiempirical simulations based on the AM1 Hamiltonian [4] used with the COSMO solvation model [5]. For the first series, the decrease in quadratic response with increasing dihedral angle indicates that oscillator strength loss is the dominant factor. In the second series, the corresponding increase in quadratic response points to the change in dipole moment upon excitation as the leading effect. Here, we will analyze to what extent the more ab initio electronic structure calculations based on the density functional theory may provide more quantitative results in spite of the problems they face in the description of charge transfer systems.

Published
2010
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200. Oligocene-Miocene foredeep deposits in the Lake Trasimeno area (Central Italy): insights into the evolution of the Northern ApenninesApennine evolution

Author

Barsella, Marco, Boscherini, Arnaldo, Botti, Flavia, Marroni, Michele, Meneghini, Francesca, Motti, Andrea, Palandri, Silvia, and Pandolfi, Luca

Subjects
Trasimeno lake area, Foredeep deposits, Northern apennines, Arenites petrography, Biostratigraphy, Arenites petrography, Biostratigraphy, Foredeep deposits, Northern apennines, Oligocene-miocene, Trasimeno lake area, Oligocene-miocene
Published
2009

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