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29 results on '"Demongodin, Pierre"'

1. Enhanced self-phase modulation in silicon nitride waveguides integrated with 2D graphene oxide films

Author

Zhang, Yuning, Wu, Jiayang, Yang, Yunyi, Qu, Yang, Dirani, Houssein El, Crochemore, Romain, Sciancalepore, Corrado, Demongodin, Pierre, Grillet, Christian, Monat, Christelle, Jia, Baohua, and Moss, David J.

Subjects
Physics - Optics
Abstract

We experimentally demonstrate enhanced self-phase modulation (SPM) in silicon nitride (Si3N4) waveguides integrated with 2D graphene oxide (GO) films. GO films are integrated onto Si3N4 waveguides using a solution-based, transfer-free coating method that enables precise control of the film thickness. Detailed SPM measurements are carried out using both picosecond and femtosecond optical pulses. Owing to the high Kerr nonlinearity of GO, the hybrid waveguides show significantly improved spectral broadening compared to the uncoated waveguide, achieving a broadening factor of up to ~3.4 for a device with 2 layers of GO. By fitting the experimental results with theory, we obtain an improvement in the waveguide nonlinear parameter by a factor of up to 18.4 and a Kerr coefficient (n2) of GO that is about 5 orders of magnitude higher than Si3N4. Finally, we provide a theoretical analysis for the influence of GO film length, coating position, and its saturable absorption on the SPM performance. These results verify the effectiveness of on-chip integrating 2D GO films to enhance the nonlinear optical performance of Si3N4 devices., Comment: 11 pages, 9 figures, 63 references. arXiv admin note: text overlap with arXiv:2205.06942

Published
2022
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2. Thickness‐ and Wavelength‐Dependent Nonlinear Optical Absorption in 2D Layered MXene Films.

Author

Jin, Di, Liu, Wenbo, Jia, Linnan, Zhang, Yuning, Hu, Junkai, El Dirani, Houssein, Kerdiles, Sébastien, Sciancalepore, Corrado, Demongodin, Pierre, Grillet, Christian, Monat, Christelle, Huang, Duan, Wu, Jiayang, Jia, Baohua, and Moss, David J.

Subjects
NONLINEAR optics, ABSORPTION coefficients, LIGHT absorption, OPTICAL properties, WAVEGUIDES
Abstract

As a rapidly expanding family of 2D materials, MXenes have recently gained considerable attention. Herein, by developing a coating method that enables transfer‐free and layer‐by‐layer film coating, the nonlinear optical absorption (NOA) of Ti3C2Tx MXene films is investigated. Using the Z‐scan technique, the NOA of the MXene films is characterized at ≈800 nm. The results show that there is a strong and layer‐dependent NOA behavior, transitioning from reverse saturable absorption (RSA) to saturable absorption (SA) as the layer number increases from 5 to 30. Notably, the nonlinear absorption coefficient β changes significantly from ≈7.13 × 102 cm GW−1 to ≈−2.69 × 102 cm GW−1 within this range. The power‐dependent NOA of the MXene films is also characterized, and a decreasing trend in β is observed for increasing laser intensity. Finally, the NOA of 2D MXene films at ≈1550 nm is characterized by integrating them onto silicon nitride waveguides, where an SA behavior is observed for the films including 5 and 10 layers of MXene, in contrast to the RSA observed at ≈800 nm. These results reveal intriguing nonlinear optical properties of 2D MXene films, highlighting their versatility and potential for implementing high‐performance nonlinear photonic devices. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Photo-thermal tuning of graphene oxide coated integrated optical waveguides

Author

Qu, Yang, primary, Yang, Yunyi, additional, Wu, Jiayang, additional, Zhang, Yuning, additional, Jia, Linnan, additional, El Dirani, Houssein, additional, Crochemore, Romain, additional, Sciancalepore, Corrado, additional, Demongodin, Pierre, additional, Grillet, Christian, additional, Monat, Christelle, additional, Jia, Baohua, additional, and Moss, David J., additional

Published
2023
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5. Graphene oxide for enhanced self-phase modulation in silicon nitride waveguides

Author

Zhang, Yuning, primary, Wu, Jiayang, additional, Yang, Yunyi, additional, Qu, Yang, additional, El Dirani, Houssein, additional, Crochemore, Romain, additional, Sciancalepore, Corrado, additional, Demongodin, Pierre, additional, Grillet, Christian, additional, Monat, Christelle, additional, Jia, Baohua, additional, and Moss, David J., additional

Published
2023
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6. Enhanced Supercontinuum Generation in Integrated Waveguides Incorporated with Graphene Oxide Films

Author

Zhang, Yuning, primary, Wu, Jiayang, additional, Yang, Yunyi, additional, Qu, Yang, additional, Jia, Linnan, additional, Dirani, Houssein El, additional, Kerdiles, Sébastien, additional, Sciancalepore, Corrado, additional, Demongodin, Pierre, additional, Grillet, Christian, additional, Monat, Christelle, additional, Jia, Baohua, additional, and Moss, David J., additional

Published
2023
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8. Photo-Thermal Tuning of Graphene Oxide Coated Integrated Optical Waveguides

Author

Qu, Yang, primary, Yang, Yunyi, additional, Wu, Jiayang, additional, Zhang, Yuning, additional, Jia, Linnan, additional, El Dirani, Houssein, additional, Crochemore, Romain, additional, Sciancalepore, Corrado, additional, Demongodin, Pierre, additional, Grillet, Christian, additional, Monat, Christelle, additional, Jia, Baohua, additional, and Moss, David J., additional

Published
2022
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9. Enhanced self-phase modulation in silicon nitride waveguides integrated with 2D graphene oxide films

Author

Zhang, Yuning, primary, Wu, Jiayang, additional, Yang, Yunyi, additional, Qu, Yang, additional, El Dirani, Houssein, additional, Crochemore, Romain, additional, Sciancalepore, Corrado, additional, Demongodin, Pierre, additional, Grillet, Christian, additional, Monat, Christelle, additional, Jia, Baohua, additional, and Moss, David J., additional

Published
2022
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10. Pulsed Four-Wave Mixing at Telecom Wavelengths in Si 3 N 4 Waveguides Locally Covered by Graphene.

Author

Demongodin, Pierre, El Dirani, Houssein, Kerdilès, Sébastien, Lhuillier, Jérémy, Wood, Thomas, Sciancalepore, Corrado, and Monat, Christelle

Subjects
*FOUR-wave mixing, *GRAPHENE, *WAVELENGTHS, *DIELECTRIC materials, *TELECOMMUNICATION
Abstract

Recently, the nonlinear optical response of graphene has been widely investigated, as has the integration of this 2D material onto dielectric waveguides so as to enhance the various nonlinear phenomena that underpin all-optical signal processing applications at telecom wavelengths. However, a great disparity continues to exist from these experimental reports, depending on the used conditions or the hybrid devices under test. Most importantly, hybrid graphene-based waveguides were tested under relatively low powers, and/or combined with waveguide materials that already exhibited a nonnegligible nonlinear contribution, thereby limiting the practical use of graphene for nonlinear applications. Here, we experimentally investigate the nonlinear response of Si 3 N 4 waveguides that are locally covered by submillimeter-long graphene patches by means of pulsed degenerate four-wave mixing at telecom wavelength under 7 W peak powers. Our measurements and comparison with simulations allow us to estimate a local change of the nonlinearity sign as well as a moderate increase of the nonlinear waveguide parameter (γ∼−10 m−1W−1) provided by graphene. Our analysis also clarifies the tradeoff associated with the loss penalty and nonlinear benefit afforded by graphene patches integrated onto passive photonic circuits, thereby providing some guidelines for the design of hybrid integrated nonlinear devices, coated with graphene, or, more generally, any other 2D material. [ABSTRACT FROM AUTHOR]

Published
2023
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12. Enhanced Self-Phase Modulation in Silicon Nitride Waveguides Integrated With 2D Graphene Oxide Films

Author

Zhang, Yuning, Wu, Jiayang, Yang, Yunyi, Qu, Yang, Dirani, Houssein El, Crochemore, Romain, Sciancalepore, Corrado, Demongodin, Pierre, Grillet, Christian, Monat, Christelle, Jia, Baohua, and Moss, David J.

Abstract

We experimentally demonstrate enhanced self-phase modulation (SPM) in silicon nitride (Si3N4) waveguides integrated with 2D graphene oxide (GO) films. GO films are integrated onto Si3N4 waveguides using a solution-based, transfer-free coating method that enables precise control of the film thickness. Detailed SPM measurements are carried out using both picosecond and femtosecond optical pulses. Owing to the high Kerr nonlinearity of GO, the hybrid waveguides show significantly improved spectral broadening compared to the uncoated waveguide, achieving a broadening factor of up to ∼3.4 for a device with 2 layers of GO. By fitting the experimental results with theory, we obtain an improvement in the waveguide nonlinear parameter by a factor of up to 18.4 and a Kerr coefficient (n2) of GO that is about 5 orders of magnitude higher than Si3N4. Finally, we provide a theoretical analysis for the influence of GO film length, coating position, and its saturable absorption on the SPM performance. These results verify the effectiveness of on-chip integrating 2D GO films to enhance the nonlinear optical performance of Si3N4 devices.

Published
2023
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13. Spatial modulation of graphene's chemical potential

Author

Lhuillier, Jérémy, Demongodin, Pierre, Wood, Thomas, Kemiche, Malik, Vilquin, Bertrand, Grenet, Geneviève, Cueff, Sébastien, Rojo-Romeo, Pedro, Letartre, Xavier, Monat, Christelle, INL - Nanophotonique (INL - Photonique), Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), INL - Hétéroepitaxie et Nanostructures (INL - H&N), European Project: 648546,H2020,ERC-2014-CoG,GRAPHICS(2015), LHUILLIER, Jérémy, GRAphene nonlinear PHotonic Integrated CircuitS - GRAPHICS - - H20202015-09-01 - 2020-09-01 - 648546 - VALID, Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), and INL - Matériaux Fonctionnels et Nanostructures (INL - MFN)

Subjects
[SPI.NANO] Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics, [PHYS.COND.CM-MS] Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci], ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2020

14. Hybrid graphene chip-based nonlinear optical devices

Author

Monat, Christelle, Demongodin, Pierre, Lhuillier, Jérémy, Wood, Thomas, KEMICHE, Malik, El Dirani, Houssein, Sciancalepore, Corrado, Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), European Project: 648546,H2020,ERC-2014-CoG,GRAPHICS(2015), Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), grillet, christian, and GRAphene nonlinear PHotonic Integrated CircuitS - GRAPHICS - - H20202015-09-01 - 2020-09-01 - 648546 - VALID

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

International audience

Published
2020

15. Low-voltage, broadband graphene-coated Bragg mirror electro-optic modulator at telecom wavelengths

Author

Wood, Thomas, Lhuillier, Jérémy, KEMICHE, Malik, Demongodin, Pierre, Vilquin, Bertrand, ROJO ROMEO, Pédro, Belarouci, Ali, Berguiga, Lotfi, Callard, Ségolène, Letartre, Xavier, Monat, Christelle, INL - Nanophotonique (INL - Photonique), Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), INL - Hétéroepitaxie et Nanostructures (INL - H&N), European Project: 648546,H2020,ERC-2014-CoG,GRAPHICS(2015), Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), and Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Physics::Optics, [SPI.NANO]Engineering Sciences [physics]/Micro and nanotechnologies/Microelectronics
Abstract

International audience; We demonstrate a graphene based electro-optic free-space modulator yielding a reflectance contrast of 20% over a strikingly large 250nm wavelength range, centered in the near-infrared telecom band. Our device is based on the original association of a planar Bragg reflector, topped with an electrically contacted double-layer graphene capacitor structure employing a high work-function oxide shown to confer a static doping to the graphene in the absence of an external bias, thereby reducing the switching voltage range to +/-1V. The device design, fabrication and opto-electric characterization is presented, and its behavior modeled using a coupled optical-electronic framework.

Published
2020

16. Enhanced Four‐Wave Mixing in Silicon Nitride Waveguides Integrated with 2D Layered Graphene Oxide Films

Author

Qu, Yang, primary, Wu, Jiayang, additional, Yang, Yunyi, additional, Zhang, Yuning, additional, Liang, Yao, additional, El Dirani, Houssein, additional, Crochemore, Romain, additional, Demongodin, Pierre, additional, Sciancalepore, Corrado, additional, Grillet, Christian, additional, Monat, Christelle, additional, Jia, Baohua, additional, and Moss, David J., additional

Published
2020
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17. Towards low-power near-infrared modulators operating at telecom wavelengths: when graphene plasmons frustrate their metallic counterparts

Author

Wood, Thomas, primary, Kemiche, Malik, additional, Lhuillier, Jérémy, additional, Demongodin, Pierre, additional, Vilquin, Bertrand, additional, Rojo-Romeo, Pedro, additional, Benamrouche, Aziz, additional, Régrény, Philippe, additional, Callard, Ségolène, additional, Letartre, Xavier, additional, and Monat, Christelle, additional

Published
2020
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19. Saturable absorption of nonlinear graphene coated Si3N4 waveguides

Author

Demongodin, Pierre, Dirani, Houssein El, Lhuillier, Jérémy, Kemiche, Malik, Wood, Thomas, Callard, Ségolène, Rojo-Romeo, Pedro, Sciancalepore, Corrado, Grillet, Christian, Monat, Christelle, INL - Nanophotonique (INL - Photonique), Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), H2020 EU project, and European Project: 648546,H2020,ERC-2014-CoG,GRAPHICS(2015)

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

International audience; We investigate the saturable absorption of hybrid graphene/ silicon-nitride waveguides at telecom wavelengths. By measuring the power dependent transmission of picosecond and sub-picosecond pulses, we clarify the temporal dynamics of photo-excited carriers in graphene.

Published
2019

20. Ultrafast saturable absorption dynamics in hybrid graphene/Si3N4 waveguides

Author

Demongodin, Pierre, primary, El Dirani, Houssein, additional, Lhuillier, Jérémy, additional, Crochemore, Romain, additional, Kemiche, Malik, additional, Wood, Thomas, additional, Callard, Ségolène, additional, Rojo-Romeo, Pedro, additional, Sciancalepore, Corrado, additional, Grillet, Christian, additional, and Monat, Christelle, additional

Published
2019
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22. Saturable absorption of nonlinear graphene coated waveguides

Author

Demongodin, Pierre, primary, Dirani, Houssein El, additional, Lhuillier, Jérémy, additional, Kemiche, Malik, additional, Wood, Thomas, additional, Callard, Ségolène, additional, Rojo-Romeo, Pedro, additional, Sciancalepore, Corrado, additional, Grillet, Christian, additional, and Monat, Christelle, additional

Published
2019
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23. Ultrafast saturable absorption dynamics in hybrid graphene/Si3N4 waveguides.

Author

Demongodin, Pierre, El Dirani, Houssein, Lhuillier, Jérémy, Crochemore, Romain, Kemiche, Malik, Wood, Thomas, Callard, Ségolène, Rojo-Romeo, Pedro, Sciancalepore, Corrado, Grillet, Christian, and Monat, Christelle

Subjects
NONLINEAR Schrodinger equation, WAVEGUIDES, INTEGRATED circuits, ABSORPTION
Abstract

We study the nonlinear optical properties of graphene integrated onto Si3N4 waveguides under picosecond and subpicosecond pulsed excitation at telecom wavelength. Saturable absorption of graphene under guided-mode excitation is measured, and the temporal effects related to the photoexcited carrier dynamics in graphene are highlighted. Thereafter, a model of photoexcited carriers in graphene is implemented into the nonlinear Schrödinger equation in order to simulate the pulse propagation across the hybrid graphene/Si3N4 waveguide. This allows us to extract phenomenological parameters of graphene saturable absorption in chip-based devices, which could provide some guidelines for the design of nonlinear elements in photonic integrated circuits. [ABSTRACT FROM AUTHOR]

Published
2019
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27. 2D Graphene Oxide: A Versatile Thermo‐Optic Material.

Author

Hu, Junkai, Wu, Jiayang, Liu, Wenbo, Jin, Di, Dirani, Houssein El, Kerdiles, Sébastien, Sciancalepore, Corrado, Demongodin, Pierre, Grillet, Christian, Monat, Christelle, Huang, Duan, Jia, Baohua, and Moss, David J.

Subjects
*GRAPHENE oxide, *OPTICAL bistability, *OPTICAL devices, *OPTICAL switches, *OPTICAL control, *BOLTED joints
Abstract

Efficient heat management and control in optical devices, facilitated by advanced thermo‐optic materials, are critical for many applications such as photovoltaics, thermal emitters, mode‐locked lasers, and optical switches. Here, a range of thermo‐optic properties of 2D graphene oxide (GO) films are investigated by precisely integrating them onto microring resonators (MRRs) with control over the film thicknesses and lengths. The refractive index, extinction coefficient, thermo‐optic coefficient, and thermal conductivity for the GO films with different layer numbers and degrees of reduction, as well as reversible reduction and enhanced optical bistability induced by the photo‐thermal effects, are comprehensively characterized. Experimental results show that the thermo‐optic properties of 2D GO films vary widely with the degree of reduction. In addition, significant anisotropy is observed for the thermo‐optic response, enabling efficient polarization‐sensitive devices. The versatile thermo‐optic response of 2D GO substantially expands the scope of functionalities and devices that can be engineered, making it promising for a diverse range of thermo‐optic applications. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Saturable absorption of nonlinear graphene coated waveguides

Author

Christelle Monat, Ségolène Callard, Houssein El Dirani, Pedro Rojo-Romeo, Thomas Wood, Christian Grillet, Corrado Sciancalepore, Malik Kemiche, Pierre Demongodin, Jérémy Lhuillier, INL - Nanophotonique (INL - Photonique), Institut des Nanotechnologies de Lyon (INL), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-École supérieure de Chimie Physique Electronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Institut des Matériaux, de Microélectronique et des Nanosciences de Provence (IM2NP), Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS)-Aix Marseille Université (AMU), Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information (CEA-LETI), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-École Centrale de Lyon (ECL), Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), H2020 EU project, European Project: 648546,H2020,ERC-2014-CoG,GRAPHICS(2015), Université de Lyon-École Supérieure de Chimie Physique Électronique de Lyon (CPE)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Aix Marseille Université (AMU)-Université de Toulon (UTLN)-Centre National de la Recherche Scientifique (CNRS), and Demongodin, Pierre

Subjects
Silicon nitride, Nonlinear photonics, Materials science, [SPI.OPTI] Engineering Sciences [physics]/Optics / Photonic, 02 engineering and technology, 01 natural sciences, law.invention, 010309 optics, chemistry.chemical_compound, Four-wave mixing, law, 0103 physical sciences, ComputingMilieux_MISCELLANEOUS, Graphene, business.industry, graphene, guided-wave optics, Saturable absorption, 021001 nanoscience & nanotechnology, Wavelength, Nonlinear system, chemistry, Mode-locking, Picosecond, [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic, Optoelectronics, 0210 nano-technology, business
Abstract

International audience; We investigate the saturable absorption of hybrid graphene/ silicon-nitride waveguides at telecom wavelengths. By measuring the power dependent transmission of picosecond and sub-picosecond pulses, we clarify the temporal dynamics of photo-excited carriers in graphene.

Published
2019

29. Low-voltage, broadband graphene-coated Bragg mirror electro-optic modulator at telecom wavelengths.

Author

Wood T, Lhuillier J, Kemiche M, Demongodin P, Vilquin B, Romeo PR, Belarouci A, Berguiga L, Callard S, Letartre X, and Monat C

Abstract

We demonstrate a graphene based electro-optic free-space modulator yielding a reflectance contrast of 20% over a strikingly large 250nm wavelength range, centered in the near-infrared telecom band. Our device is based on the original association of a planar Bragg reflector, topped with an electrically contacted double-layer graphene capacitor structure employing a high work-function oxide shown to confer a static doping to the graphene in the absence of an external bias, thereby reducing the switching voltage range to +/-1V. The device design, fabrication and opto-electric characterization is presented, and its behavior modeled using a coupled optical-electronic framework.

Published
2020
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