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73 results on '"Garreau, Alexandre"'

51. Silicon Nitride Bragg Grating With Joule Thermal Tuning for External Cavity Lasers.

Author

Primiani, Peppino, Boust, Sylvain, Fedeli, Jean-Marc, Duport, Francois, Gomez, Carmen, Paret, Jean-Francois, Garreau, Alexandre, Mekhazni, Karim, Fortin, Catherine, and Van Dijk, Frederic

Abstract

The letter presents a fabrication platform based on silicon nitride embedded in silica on silicon wafers. Long Bragg gratings have been fabricated for narrow linewidth lasers. A narrow stop-band (0.2 nm) Bragg grating with etched facet chips is achieved in this platform. Heaters have been integrated on the chips allowing tuning of the Bragg wavelength over 1.5 nm. Lasers have been obtained and tested by butt-coupling of one of these Bragg gratings to a reflective semiconductor optical amplifier (R-SOA). On these laser cavities, we obtained a continuous tuning range of 0.16 nm and a discontinuous tuning range of 1.5 nm. [ABSTRACT FROM AUTHOR]

Published
2019
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56. Design of luminescent organic nanowires and transition-metal clusters compounds –based hybrid nanowires

Author

Garreau, Alexandre, Institut des Molécules et Matériaux du Mans (IMMM), Le Mans Université (UM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université du Maine, Alain Bulou, Jean-Luc Duvail, Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), and STAR, ABES

Subjects
Polymères n-conjugués, Méthode template, [PHYS.COND.CM-GEN] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Clusters de métaux de transition, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other], Hybrid Nanomaterials, Nanophotonique, Nanomatériaux hybrides, Transition-metal clusters, Nanofils coaxiaux, Photoluminescence, Transferts d'énergie
Abstract

Luminescent organic nanostructures are of great importance as building blocks in future miniaturized photonic and optoelectronic devices because these systems rely upon the ability to tune and get new optical characteristics. One-dimensional luminescent nanostructures are new and promising systems with complex morphologies now available. In this work, we particularly investigated the control and the tuning of the emitted color of two-luminophore based nanowires. In a first part, an unfamiliar family of luminophore has been investigated: the octahedral molybdenum clusters. The vibrational modes frequencies of Mo6Br14 cluster were fully determined, as well as their photophysical properties. The unique features of these clusters were exploited into nanowires.Then, using a template method, we designed coaxial nanowires allowing the spatial separation of the two luminophores. The transition metal clusters in a PMMA matrix and PPV were selected as red and green emitters, respectively, to achieve the spectral separation. Remarkably, it was found from time-resolved photoluminescence study and confirmed by a phenomenological model that any charge or energy transfer is involved in this system.Alternatively, coaxial and blend designs were used to investigate and possibly tune energy/charge transfers involved in the donor-acceptor behavior of two conjugated polymers: PFO (blue emitter) and F8T2 (green emitter). These results demonstrate the great versatility of polymer-based nanowires to finely control at the nanoscale the emission features of multi-luminophore materials., Le fort engouement pour les nanostructures luminescentes provient de leurs comportements émissifs originaux et de leur potentiel comme briques élémentaires pour de futurs dispositifs photoniques et optoélectroniques. Dans cette thèse, nous nous sommes intéressés au contrôle de la couleur d’émission de nano-systèmes 1D organiques composés de deux types de luminophores. Dans une première partie, une famille peu connue de luminophores nanométriques a été étudiée: les clusters octaédriques de molybdène. Leur comportement photophysique et l’ensemble des fréquences des modes de vibration de l’entité Mo6Br14 ont été déterminés. Les spécificités de ces clusters ont été exploitées au sein de nanofils.Un premier type de nanofil coaxial synthétisé par méthode template a été conçu afin de séparer les deux types de luminophores. Les clusters (dans une matrice de PMMA) et le PPV ont été sélectionnés comme émetteurs rouge et vert respectivement, pour avoir une séparation spectrale. Le contrôle de la couleur sans transfert de charge ou d’énergie entre les deux luminophores a été validé par l’étude du comportement de photoluminescence stationnaire et résolue en temps, en accord avec un modèle phénoménologique. A l’opposé, des nanofils exploitant deux polymères conjugués fluorescents (PFO bleu, F8T2 vert) comme système donneur-accepteur ont été élaborés. Leur mélange ou leur séparation en géométrie cœur-gaine a permis d’explorer une nouvelle voie pour moduler les comportements excitoniques. Ces résultats montrent la versatilité des nanofils à base de polymère pour contrôler à l’échelle nanométrique les comportements d’émission de systèmes multi-luminophores.

Published
2013

58. Opportunities for polymer-based nanowires in optoelectronics and nanophotonics

Author

Duvail, Jean-Luc, Garreau, Alexandre, Lorcy, J.M., Massuyeau, F., Cordier, Stéphane, Molard, Y., Bulou, A., Bigeon, John, Huby, Nolwenn, Bêche, Bruno, Ewels, Christopher, Mevellec, J.Y., Wéry, J., Faulques, Eric, Institut des Matériaux Jean Rouxel (IMN), Université de Nantes - UFR des Sciences et des Techniques (UN UFR ST), Université de Nantes (UN)-Université de Nantes (UN)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN), 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), Laboratoire de physique de l'état condensé (LPEC), Centre National de la Recherche Scientifique (CNRS)-Le Mans Université (UM), Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Institut Universitaire de France (IUF), Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.), Université de Nantes (UN)-Université de Nantes (UN)-Ecole Polytechnique de l'Université de Nantes (EPUN), Université de Nantes (UN)-Université de Nantes (UN)-Institut de Chimie du CNRS (INC)-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), Le Mans Université (UM)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, InformationSystems_DATABASEMANAGEMENT, [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, ComputingMilieux_MISCELLANEOUS
Abstract

International audience; See document joined

Published
2012

59. Colorless Components for WDM-based Optical Access Networks

Author

Nguyen, Quoc Thai, Girault, Gwenaëlle, Vaudel, Olivier, Bramerie, Laurent, Besnard, Pascal, Shen, Alexandre, Duan, Guang-Hua, Kazmierski, Christophe, Lobo, Sebastien, Joindot, Michel, Simon, Jean-Claude, Dupuis, Nicolas, Garreau, Alexandre, Belfqih, Zineb, Chanclou, Philippe, Fonctions Optiques pour les Technologies de l'informatiON (FOTON), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), 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), Alcatel-Thalès III-V lab (III-V Lab), THALES [France]-ALCATEL, Orange Labs [Lannion], France Télécom, Institute of Physics (IOP) - Vietnam Academy of Science and Technology (VAST), ANR-06-TCOM-0008,ANTARES,composANTs Achromatiques pour les Réseau d'accES haut débit 'colourless components for high speed optical access'(2006), Nguyen, Quoc Thai, Programme Télécommunications - composANTs Achromatiques pour les Réseau d'accES haut débit 'colourless components for high speed optical access' - - ANTARES2006 - ANR-06-TCOM-0008 - TCOM - VALID, 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)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-École Nationale Supérieure des Sciences Appliquées et de Technologie (ENSSAT)-Télécom Bretagne, and THALES-ALCATEL

Subjects
[SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic
Abstract

Section B "PHOTONICS & LASERS AND APPLICATIONS" [B-45]; International audience; This paper presents our work carried out in the colorless-component technologies for high bit-rate optical access networks, which are based on WDM-PON (wavelength division multiplexed passive optical networks). The colorless concept consists in using identical and wavelength-independent components that will act as the generic transmitter in WDM-PON systems. The transmitted wavelength is imposed, for each colorless component, by an external optical signal. Our studies include two types of colorless components: The Injection-Locked Fabry-Perot laser (IL-FP) and the Reflective Electro-Absorption Modulator integrated with a Semiconductor Optical Amplifier (REAM-SOA). For the IL-FP, the properties of the component strongly depend on the injected optical signal. We demonstrate the improvement by injection-locking of the laser's performances in terms of intensity noise, chirp and bandwidth. For the REAM-SOA, the static properties such as reflection gain and noise characteristic are examined. We demonstrate the feasibility of the REAM-SOA in a transmission experiment in a PON configuration at 10 Gbps with up to 25 km of SMF, using remote modulation technique.

Published
2008

64. Color Control in Coaxial Two-Luminophore Nanowires

Author

Garreau, Alexandre, primary, Massuyeau, Florian, additional, Cordier, Stéphane, additional, Molard, Yann, additional, Gautron, Eric, additional, Bertoncini, Patricia, additional, Faulques, Eric, additional, Wery, Jany, additional, Humbert, Bernard, additional, Bulou, Alain, additional, and Duvail, Jean-Luc, additional

Published
2013
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65. 40-Gb/s Colorless Reflective Amplified Modulator

Author

Lawniczuk, Katarzyna, primary, Patard, Olivier, additional, Guillamet, Ronan, additional, Chimot, Nicolas, additional, Garreau, Alexandre, additional, Kazmierski, Christophe, additional, Aubin, Guy, additional, and Merghem, Kamel, additional

Published
2013
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68. 10 Gbit/s Semi-Insulating Buried Heterostructure Loss-less Reflective Amplified Modulator for Wavelength Agnostic Networks

Author

Dupuis, Nicolas, primary, Garreau, Alexandre, additional, Jany, Christophe, additional, Decobert, Jean, additional, Alexandre, Francois, additional, Brenot, Romain, additional, Landreau, Jean, additional, Lagay, Nadine, additional, Martin, Florence, additional, Carpentier, Daniele, additional, and Kazmierski, Christophe, additional

Published
2008
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69. 10 Gbit/s 1.55¿m 25km transmission at 90°C with New Self Thermally Compensated AlGaInAs Directly Modulated Laser

Author

Jany, Christophe, primary, Decobert, Jean, additional, Alexandre, Francois, additional, Garreau, Alexandre, additional, Provost, Jean-Guy, additional, Drisse, Olivier, additional, Derouin, Estelle, additional, Blache, Fabrice, additional, Landreau, Jean, additional, Lagay, Nadine, additional, Martin, Florence, additional, Carpentier, Daniele, additional, and Kazmierski, Christophe, additional

Published
2007
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70. 10 Gbit/s Coolerless Operation of a New AlGalnAs Single Active Layer Electroabsorption Modulated Laser with Self Thermal Compensation

Author

Cuisin, Maria-Cornelia, primary, Garreau, Alexandre, additional, Jany, Christophe, additional, Decobert, Jean, additional, Drisse, Olivier, additional, Derouin, Estelle, additional, Blache, Fabrice, additional, Landreau, Jean, additional, Lagay, Nadine, additional, Carpentier, Daniele, additional, and Kazmierski, Christophe, additional

Published
2006
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73. Self-ordering promoted by the nanoconfinement of poly(3-hexylthiophene) and its nanocomposite with single-walled carbon nanotubes.

Author

Khlaifia D, Désert A, Mbarek M, Garreau A, Mevellec JY, Massuyeau F, Faulques E, Alimi K, and Duvail JL

Abstract

Nanostructuration and self-ordering of semiconducting organic materials are required to fabricate highly efficient photovoltaic and photoemissive devices. In this work, we investigated the combined effect of melt-assisted template processing and self-ordering of high purity regio-regular poly (3-hexylthiophene) (P3HT) to obtain nanofibers of P3HT and of P3HT-single-walled carbon nanotubes (SWNT) nanocomposites. An original ordering of the polymer and the carbon nanotubes within the nanofibers, as well as their surprising anisotropic photoluminescent properties were determined by vibrational and optical spectroscopy. It was attributed to the combined effect of the melt-assisted wetting confined within alumina nanopores, altogether with the self-organization of both P3HT chains on the one hand, and of the P3HT charged with SWNT on the other hand. It is proposed that the well-ordered regio-regular P3HT matrix orientation is promoted by the interaction with the alumina pore surface and the 1D confinement. For the composite case, the P3HT matrix imposes additionally a preferential orientation of the SWNT transversal to the nanofiber axis. This original organization is responsible for the unexpected polarization of the composite nanofibers photoluminescence. This work opens the way to alternative methods for tackling challenges of nanofabrication to obtain more efficient optoelectronic nanodevices.

Published
2019
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