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Your search keyword '"Dantec, Ronan Le"' showing total 15 results
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15 results on '"Dantec, Ronan Le"'

1. Bismuth Ferrite Dielectric Nanoparticles Excited at Telecom Wavelengths as Multicolor Sources by Second, Third, and Fourth Harmonic Generation

Author

Riporto, Jeremy, Demierre, Alexis, Schmidt, Cédric, Campargue, Gabriel, Kilin, Vasyl, Balciunas, Tadas, Urbain, Mathias, Baltuska, Andrius, Dantec, Ronan Le, Wolf, Jean-Pierre, Mugnier, Yannick, and Bonacina, Luigi

Subjects
Physics - Optics
Abstract

We demonstrate the simultaneous generation of second, third, and fourth harmonic from a single dielectric Bismuth Ferrite nanoparticle excited by a telecom fiber laser at 1560 nm. We first characterize the signals associated with different nonlinear orders in terms of spectrum, excitation intensity dependence, and relative signal strengths. Successively, on the basis of the polarization-resolved emission curves of the three harmonics, we discuss the interplay of susceptibility tensor components at the different orders and we show how polarization can be used as an optical handle to control the relative frequency conversion properties., Comment: include S.I. section at the end of the main pdf file

Published
2017

2. Cellular Uptake and Biocompatibility of Bismuth Ferrite Harmonic Advanced Nanoparticles

Author

Staedler, Davide, Passemard, Solène, Magouroux, Thibaud, Rogov, Andrii, Maguire, Ciaran Manus, Mohamed, Bashir M., Schwung, Sebastian, Rytz, Daniel, Jüstel, Thomas, Hwu, Stéphanie, Mugnier, Yannick, Dantec, Ronan Le, Volkov, Yuri, Gerber-Lemaire, Sandrine, Prina-Melloc, Adriele, Bonacina, Luigi, and Wolf, Jean-Pierre

Subjects
Quantitative Biology - Cell Behavior, Physics - Biological Physics
Abstract

Bismuth Ferrite (BFO) nanoparticles (BFO-NP) display interesting optical (nonlinear response) and magnetic properties which make them amenable for bio-oriented applications as intra- and extra membrane contrast agents. Due to the relatively recent availability of this material in well dispersed nanometric form, its biocompatibility was not known to date. In this study, we present a thorough assessment of the effects of in vitro exposure of human adenocarcinoma (A549), lung squamous carcinoma (NCI-H520), and acute monocytic leukemia (THP-1) cell lines to uncoated and poly(ethylene glycol)-coated BFO-NP in the form of cytotoxicity, haemolytic response and biocompatibility. Our results support the attractiveness of the functional-BFO towards biomedical applications focused on advanced diagnostic imaging., Comment: Abstract Word Count: 109 Complete Word Count (body text and figure legends) : 4886 Number of Figures: 6 Number of Tables: 0 Number of reference: 45

Published
2014

3. BiFeO3 nanocrystals for bio-imaging based on nonlinear optical harmonic generation

Author

Schwung, Sebastian, Rogov, Andrii, Clarke, Gareth, Joulaud, Cécile, Magouroux, Thibaud, Staedler, Davide, Passemard, Solène, Jüstel, Thomas, Badie, Laurent, Galez, Christine, Wolf, Jean Pierre, Volkov, Yuri, Prina-Mello, Adriele, Gerber-Lemaire, Sandrine, Rytz, Daniel, Mugnier, Yannick, Bonacina, Luigi, and Dantec, Ronan Le

Subjects
Physics - Optics, Condensed Matter - Materials Science
Abstract

Second Harmonic Generation (SHG) from BiFeO3 nanocrystals is investigated for the first time to determine their potential as biomarkers for multiphoton imaging. Nanocrystals are produced by an auto-combustion method with TRIS as a fuel. Stable colloidal suspensions with mean particle diameters in the range 100-120 nm are then obtained after wet-milling and sonication steps. SHG properties are determined using two complementary experimental techniques, Hyper Rayleigh Scattering and nonlinear polarization microscopy. BiFeO3 shows a very high second harmonic efficiency with an averaged coefficient of 79+-12 pm/V. From the nonlinear polarization response of individual nanocrystals, relative values of the independent dij coefficients are also determined and compared with recent theoretical and experimental studies. Additionally, the particles show a moderate magnetic response, which is attributed to gamma-Fe2O3 impurities. A combination of high nonlinear optical efficiency and magnetic response within the same particle is of great interest for future bio-imaging and diagnostic applications.

Published
2014

6. Optical properties of Yb3+,Er3+-doped SHG-active -La(IO3)3 nanocrystals prepared from a microwave-assisted synthesis

Author

Regny, S, Bredillet, K, Riporto, J, Mugnier, Yannick, Dantec, Ronan Le, Gautier-Luneau, I., Dantelle, Géraldine, Laboratoire SYstèmes et Matériaux pour la MEcatronique (SYMME), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Optique et Matériaux (OPTIMA ), Institut Néel (NEEL), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

10. In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

Author

Mugnier, Yannick, primary, Houf, Latifa, additional, El-Kass, Moustafa, additional, Dantec, Ronan Le, additional, Hadji, Rachid, additional, Vincent, Brice, additional, Djanta, Gnon, additional, Badie, Laurent, additional, Joulaud, Cécile, additional, Eschbach, Julien, additional, Rouxel, Didier, additional, and Galez, Christine, additional

Published
2010
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12. Optical Properties of Li Doped KTaO3 Using Spectroscopic Ellipsometer.

Author

Yokota, Hiroko, Teyssier, Jeremie, Dantec, Ronan Le, Uesu, Yoshiaki, and Bouillot, Jacques

Subjects
REFRACTIVE index, CRYSTALS, CRYSTAL optics, ELLIPSOMETRY, OPTICAL polarization, THIN films, SURFACES (Technology)
Abstract

Measurements of complex refractive indices n* = n - iκ are performed on pure KTaO3 and K0.93Li0.07TaO3 single crystals by using a spectroscopic ellipsometer in temperature range from room temperature to 10 K. At room temperature, experimentally obtained complex dielectric constants ε* = ε1-iε2 of both crystals are analyzed by the classical Drude model. Temperature dependence of the imaginary part ε2 of K0.93Li0.07TaO3 shows a small but distinct change around 70 K. The origin of the anomalous behavior is discussed. [ABSTRACT FROM AUTHOR]

Published
2007
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13. In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

Author

Mugnier, Yannick, Houf, Latifa, El-Kass, Moustafa, Dantec, Ronan Le, Hadji, Rachid, Vincent, Brice, Djanta, Gnon, Badie, Laurent, Joulaud, Cécile, Eschbach, Julien, Rouxel, Didier, and Galez, Christine

Abstract

A detailed experimental investigation of the formation mechanisms of acentric iron iodate [Fe(IO3)3] nanocrystals in AOT-based reverse micelles according to the water-in-oil (w/o) microemulsion (ME) composition and temperature was performed. A low chemical reaction rate was first demonstrated by means of UV−vis absorption spectroscopy. Attainment of iron iodate crystalline nanorods was then attributed to an oriented aggregation mechanism of 10−20-nm amorphous primary nanoparticles. As for the intermicellar exchange of reactants, the aggregation mechanism was also found to be determined by the ME composition because clear effects of the surfactant and reactant concentrations, the nature of the oil phase, and the water droplet size were observed. Moreover, a combination of dynamic light scattering, X-ray diffraction, and transmission electron microscopy experiments revealed that hyper-Rayleigh scattering is a fast, valuable, and nondestructive alternative to probe, in real time, the crystallization and formation dynamics of acentric nanoparticles in microemulsions. This experimental approach can be extended to studies dealing with the formation of metal nanoparticles for which scattering of second-harmonic light is readily observed.

Published
2011
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14. On the Reaction Pathways and Growth Mechanisms of LiNbO 3 Nanocrystals from the Non-Aqueous Solvothermal Alkoxide Route.

Author

Urbain, Mathias, Riporto, Florian, Beauquis, Sandrine, Monnier, Virginie, Marty, Jean-Christophe, Galez, Christine, Durand, Christiane, Chevolot, Yann, Dantec, Ronan Le, and Mugnier, Yannick

Subjects
NANOCRYSTALS, CRYSTAL structure, TRANSMISSION electron microscopy, LIGHT scattering, COLLOIDAL stability
Abstract

Phase-pure, highly crystalline sub-50 nm LiNbO3 nanocrystals were prepared from a non-aqueous solvothermal process for 72 h at 230 °C and a commercial precursor solution of mixed lithium niobium ethoxide in its parent alcohol. A systematic variation of the reaction medium composition with the addition of different amounts of co-solvent including butanol, 1,3-propanediol, 1,4-butanediol, and 1,5-pentanediol resulted in the formation of nanocrystals of adjustable mean size and shape anisotropy, as demonstrated from XRD measurements and TEM imaging. Colloidal stability of ethanol- and water-based suspensions was evaluated from dynamic light scattering (DLS)/zeta potential studies and correlated with FTIR data. Thanks to the evolution in the nanocrystal size and shape distribution we observed, as well as to the available literature on the alkoxide chemistry, the reaction pathways and growth mechanisms were finally discussed with a special attention on the monomer formation rate, leading to the nucleation step. The polar, non-perovskite crystalline structure of LiNbO3 was also evidenced to play a major role in the nanocrystal shape anisotropy. [ABSTRACT FROM AUTHOR]

Published
2021
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15. Nonlinear optical susceptibility of two-dimensional WS 2 measured by hyper Rayleigh scattering.

Author

Forcherio GT, Riporto J, Dunklin JR, Mugnier Y, Dantec RL, Bonacina L, and Roper DK

Abstract

Hyper Rayleigh scattering (HRS) was used to measure the second-order nonlinear susceptibility, χ (2) , for liquid exfoliated WS 2 monolayers. To the best of our knowledge, it is the first reported application of the HRS technique to assess the bulk-like χ (2) of a two-dimensional (2D) material. The concentration-dependent HRS signal indicated a 4.90±0.30×10 -25   esu first hyperpolarizability for 42 nm WS 2 monolayers under 1064 nm laser irradiation using para-nitroaniline as an external reference. The corresponding value of χxxx(2) was calculated to be 460±28  pm V -1 . This was within 46% of independent density functional theory predictions. Agreement with theory was improved over related microscopy-based approaches. These results support the use of HRS to evaluate 2D materials for nonlinear frequency mixing applications.

Published
2017
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