Sylvain Combrié - Academia.edu (original) (raw)
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Papers by Sylvain Combrié
Optics express, Jan 5, 2018
We demonstrate that conformal encapsulation using atomic layer deposition of GaAs nano-cavity res... more We demonstrate that conformal encapsulation using atomic layer deposition of GaAs nano-cavity resonator made of photonic crystal cavity prevents photo-induced oxidation. This improvement allows injecting a large quantity of energy in the resonator without any degradation of the material, thus enabling spectral stability of the resonance. We prove second harmonic and third harmonic generation over more than one decade of pump power variation, thanks to this encapsulation, with a total efficiency (ηSHG = 8.3 × 10 W and ηTHG = 1.2 × 10 W ) and a large net output energy for both operations (PSHGout=0.2nW and PTHGout=8pW).
Optics express, Jan 6, 2017
Weakly coupled high-Q nanophotonic cavities are building blocks of slow-light waveguides and othe... more Weakly coupled high-Q nanophotonic cavities are building blocks of slow-light waveguides and other nanophotonic devices. Their functionality critically depends on tuning as resonance frequencies should stay within the bandwidth of the device. Unavoidable disorder leads to random frequency shifts which cause localization of the light in single cavities. We present a new method to finely tune individual resonances of light in a system of coupled nanocavities. We use holographic laser-induced heating and address thermal crosstalk between nanocavities using a response matrix approach. As a main result we observe a simultaneous anticrossing of 3 nanophotonic resonances, which were initially split by disorder.
Applied optics, Jan 10, 2017
Ga<sub>0.51</sub>In<sub>0.49</sub>P is a promising candidate for thermall... more Ga<sub>0.51</sub>In<sub>0.49</sub>P is a promising candidate for thermally tunable nanophotonic devices due to its low thermal conductivity. In this work we study its thermo-optical response. We obtain the linear thermo-optical coefficient dn/dT=2.0±0.3·10<sup>-4</sup> K<sup>-1</sup> by investigating the transmission properties of a single mode-gap photonic crystal nanocavity.
Optics Letters, 2017
We demonstrated a twofold acceleration of the fast time constant characterizing the recovery of a... more We demonstrated a twofold acceleration of the fast time constant characterizing the recovery of a p-doped indium-phosphide photonic crystal all-optical gate. Time-resolved spectral analysis is compared to a three-dimensional drift-diffusion model for the carrier dynamics, demonstrating the transition from the ambipolar to the faster minority carrier dominated diffusion regime. This opens the perspective for faster yet efficient nanophotonic all-optical gates.
Optics express, Jan 19, 2016
Near the band edge of photonic crystal waveguides, localized modes appear due to disorder. We dem... more Near the band edge of photonic crystal waveguides, localized modes appear due to disorder. We demonstrate a new method to elucidate spatial profile of the localized modes in such systems using precise local tuning. Using deconvolution with the known thermal profile, the spatial profile of a localized mode with quality factor (Q) > 10<sup>5</sup> is successfully reconstructed with a resolution of 2.5 μm.
Photonic Crystal Materials and Devices XII, 2016
Conference on Lasers and Electro-Optics, 2016
Optics letters, 2015
The dispersion of a coupled resonator optical waveguide made of photonic crystal mode-gap cavitie... more The dispersion of a coupled resonator optical waveguide made of photonic crystal mode-gap cavities is pronouncedly asymmetric. This asymmetry cannot be explained by the standard tight binding model. We show that the fundamental cause of the asymmetric dispersion is the inherent dispersive cavity mode profile; i.e., the mode wave function depends on the driving frequency, not the eigenfrequency. This occurs because the photonic crystal cavity resonances do not form a complete set. We formulate a dispersive mode coupling model that accurately describes the asymmetric dispersion without introducing any new free parameters.
... Exaltation des nonlinéarités dans les guides à modes lents. Alexandre Baron 1 , Aleksandr Rya... more ... Exaltation des nonlinéarités dans les guides à modes lents. Alexandre Baron 1 , Aleksandr Ryasnyanskiy 1 , Quynh Vy Tran 2 , Sylvain Combrié 2 , Nicolas Dubreuil 1 , Philippe Delaye 1 , Alfredo De Rossi 2 , Robert Frey 1 , Gérald Roosen 1. (13/05/2009). ...
The carrier lifetime of a photonic crystal all-optical switch is optimized by controlling the sur... more The carrier lifetime of a photonic crystal all-optical switch is optimized by controlling the surface of GaAs by Atomic Layer Deposition. We demonstrate an all optical modulation capability up to 100GHz at Telecom wavelengths, with a contrast as high as 7dB. Wavelength conversion has also been demonstrated at a repetition rate of 2.5GHz with average pump power of about 0.5mW
Applied Physics Letters, 2015
CLEO: 2015, 2015
ABSTRACT Atomic Layer Deposition is used to control the surface recombination of carriers in GaAs... more ABSTRACT Atomic Layer Deposition is used to control the surface recombination of carriers in GaAs photonic crystal cavities. All-optical wavelength conversion at a GHz repetition rate is demonstrated with recovery time below 10 ps
Optics express, Jan 5, 2018
We demonstrate that conformal encapsulation using atomic layer deposition of GaAs nano-cavity res... more We demonstrate that conformal encapsulation using atomic layer deposition of GaAs nano-cavity resonator made of photonic crystal cavity prevents photo-induced oxidation. This improvement allows injecting a large quantity of energy in the resonator without any degradation of the material, thus enabling spectral stability of the resonance. We prove second harmonic and third harmonic generation over more than one decade of pump power variation, thanks to this encapsulation, with a total efficiency (ηSHG = 8.3 × 10 W and ηTHG = 1.2 × 10 W ) and a large net output energy for both operations (PSHGout=0.2nW and PTHGout=8pW).
Optics express, Jan 6, 2017
Weakly coupled high-Q nanophotonic cavities are building blocks of slow-light waveguides and othe... more Weakly coupled high-Q nanophotonic cavities are building blocks of slow-light waveguides and other nanophotonic devices. Their functionality critically depends on tuning as resonance frequencies should stay within the bandwidth of the device. Unavoidable disorder leads to random frequency shifts which cause localization of the light in single cavities. We present a new method to finely tune individual resonances of light in a system of coupled nanocavities. We use holographic laser-induced heating and address thermal crosstalk between nanocavities using a response matrix approach. As a main result we observe a simultaneous anticrossing of 3 nanophotonic resonances, which were initially split by disorder.
Applied optics, Jan 10, 2017
Ga<sub>0.51</sub>In<sub>0.49</sub>P is a promising candidate for thermall... more Ga<sub>0.51</sub>In<sub>0.49</sub>P is a promising candidate for thermally tunable nanophotonic devices due to its low thermal conductivity. In this work we study its thermo-optical response. We obtain the linear thermo-optical coefficient dn/dT=2.0±0.3·10<sup>-4</sup> K<sup>-1</sup> by investigating the transmission properties of a single mode-gap photonic crystal nanocavity.
Optics Letters, 2017
We demonstrated a twofold acceleration of the fast time constant characterizing the recovery of a... more We demonstrated a twofold acceleration of the fast time constant characterizing the recovery of a p-doped indium-phosphide photonic crystal all-optical gate. Time-resolved spectral analysis is compared to a three-dimensional drift-diffusion model for the carrier dynamics, demonstrating the transition from the ambipolar to the faster minority carrier dominated diffusion regime. This opens the perspective for faster yet efficient nanophotonic all-optical gates.
Optics express, Jan 19, 2016
Near the band edge of photonic crystal waveguides, localized modes appear due to disorder. We dem... more Near the band edge of photonic crystal waveguides, localized modes appear due to disorder. We demonstrate a new method to elucidate spatial profile of the localized modes in such systems using precise local tuning. Using deconvolution with the known thermal profile, the spatial profile of a localized mode with quality factor (Q) > 10<sup>5</sup> is successfully reconstructed with a resolution of 2.5 μm.
Photonic Crystal Materials and Devices XII, 2016
Conference on Lasers and Electro-Optics, 2016
Optics letters, 2015
The dispersion of a coupled resonator optical waveguide made of photonic crystal mode-gap cavitie... more The dispersion of a coupled resonator optical waveguide made of photonic crystal mode-gap cavities is pronouncedly asymmetric. This asymmetry cannot be explained by the standard tight binding model. We show that the fundamental cause of the asymmetric dispersion is the inherent dispersive cavity mode profile; i.e., the mode wave function depends on the driving frequency, not the eigenfrequency. This occurs because the photonic crystal cavity resonances do not form a complete set. We formulate a dispersive mode coupling model that accurately describes the asymmetric dispersion without introducing any new free parameters.
... Exaltation des nonlinéarités dans les guides à modes lents. Alexandre Baron 1 , Aleksandr Rya... more ... Exaltation des nonlinéarités dans les guides à modes lents. Alexandre Baron 1 , Aleksandr Ryasnyanskiy 1 , Quynh Vy Tran 2 , Sylvain Combrié 2 , Nicolas Dubreuil 1 , Philippe Delaye 1 , Alfredo De Rossi 2 , Robert Frey 1 , Gérald Roosen 1. (13/05/2009). ...
The carrier lifetime of a photonic crystal all-optical switch is optimized by controlling the sur... more The carrier lifetime of a photonic crystal all-optical switch is optimized by controlling the surface of GaAs by Atomic Layer Deposition. We demonstrate an all optical modulation capability up to 100GHz at Telecom wavelengths, with a contrast as high as 7dB. Wavelength conversion has also been demonstrated at a repetition rate of 2.5GHz with average pump power of about 0.5mW
Applied Physics Letters, 2015
CLEO: 2015, 2015
ABSTRACT Atomic Layer Deposition is used to control the surface recombination of carriers in GaAs... more ABSTRACT Atomic Layer Deposition is used to control the surface recombination of carriers in GaAs photonic crystal cavities. All-optical wavelength conversion at a GHz repetition rate is demonstrated with recovery time below 10 ps