ORCID Profile
0000-0003-1892-9726
Current Organisation
Centre National de la Recherche Scientifique
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Publisher: Springer Science and Business Media LLC
Date: 19-08-2019
Publisher: American Physical Society (APS)
Date: 29-05-2019
Publisher: AIP Publishing
Date: 29-01-2007
DOI: 10.1063/1.2435515
Abstract: The authors report on parametric luminescence in a single pillar semiconductor microcavity. Nonresonant photoluminescence measurements at 10K show that micropillars operate in the exciton-photon strong coupling regime. Under resonant excitation, polariton parametric scattering is observed: signal and idler beams are of comparable intensities, a promising result in the framework of quantum optics with correlated photon pairs.
Publisher: AIP Publishing
Date: 10-10-2011
DOI: 10.1063/1.3651493
Abstract: We report on an integrated GaAs disk/waveguide system. A millimeter-long waveguide is suspended and tapered on the chip over a length of 25 μm to evanescently couple to high Q optical whispering gallery modes of a GaAs disk. The critical coupling regime is obtained both by varying the disk/guide gap distance and the width of the suspended nanoscale taper. Experimental results are in good agreement with predictions from coupled mode theory.
Publisher: IEEE
Date: 06-2019
Publisher: Stichting SciPost
Date: 19-12-2018
DOI: 10.21468/SCIPOSTPHYS.5.6.064
Abstract: We report polariton lasing in localised gap states in a honeycomb lattice of coupled micropillars. Localisation of the modes is induced by the optical potential created by the excitation beam, requiring no additional engineering of the otherwise homogeneous polariton lattice. The spatial shape of the gap states arises from the interplay of the orbital angular momentum eigenmodes of the cylindrical potential created by the excitation beam and the hexagonal symmetry of the underlying lattice. Our results provide insights into the engineering of defect states in two-dimensional lattices.
Publisher: Springer Science and Business Media LLC
Date: 07-04-2022
Publisher: American Chemical Society (ACS)
Date: 02-03-2020
Publisher: Springer Science and Business Media LLC
Date: 07-03-2016
Publisher: Springer Science and Business Media LLC
Date: 24-01-2017
DOI: 10.1038/NCOMMS14267
Abstract: Photonic lattices of mutually interacting indistinguishable cavities represent a cornerstone of collective phenomena in optics and could become important in advanced sensing or communication devices. The disorder induced by fabrication technologies has so far hindered the development of such resonant cavity architectures, while post-fabrication tuning methods have been limited by complexity and poor scalability. Here we present a new simple and scalable tuning method for ensembles of microphotonic and nanophotonic resonators, which enables their permanent collective spectral alignment. The method introduces an approach of cavity-enhanced photoelectrochemical etching in a fluid, a resonant process triggered by sub-bandgap light that allows for high selectivity and precision. The technique is presented on a gallium arsenide nanophotonic platform and illustrated by finely tuning one, two and up to five resonators. It opens the way to applications requiring large networks of identical resonators and their spectral referencing to external etalons.
Publisher: AIP Publishing
Date: 11-06-2012
DOI: 10.1063/1.4729014
Publisher: AIP Publishing
Date: 14-03-2011
DOI: 10.1063/1.3563711
Abstract: We report on wavelength-sized GaAs optomechanical disk resonators showing ultrastrong optomechanical interaction. We observe optical transduction of a disk mechanical breathing mode with 1.4 GHz frequency and effective mass of ∼2 pg. The measured vacuum optomechanical coupling rate reaches g0=0.8 MHz, with a related differential optomechanical coupling factor gom=485 GHz/nm. The disk Brownian motion is optically resolved with a sensitivity of 10−17 m/√Hz at room temperature and pressure.
Publisher: American Physical Society (APS)
Date: 23-12-2010
Publisher: Springer Science and Business Media LLC
Date: 18-02-2019
DOI: 10.1038/S41563-019-0281-Z
Abstract: Over the past decade, exciton-polaritons in semiconductor microcavities have revealed themselves as one of the richest realizations of a light-based quantum fluid
Publisher: American Physical Society (APS)
Date: 17-06-2013
Publisher: IOP Publishing
Date: 04-02-2015
Publisher: AIP Publishing
Date: 18-04-2011
DOI: 10.1063/1.3582912
Publisher: The Optical Society
Date: 14-04-2016
Publisher: IEEE
Date: 2016
Publisher: American Physical Society (APS)
Date: 02-11-2020
Publisher: American Physical Society (APS)
Date: 09-02-2017
Publisher: Wiley
Date: 11-04-2017
Publisher: American Physical Society (APS)
Date: 12-02-2019
Publisher: Beilstein Institut
Date: 27-08-2018
DOI: 10.3762/BJNANO.9.215
Abstract: Background: Dielectric nanoantennas have recently emerged as an alternative solution to plasmonics for nonlinear light manipulation at the nanoscale, thanks to the magnetic and electric resonances, the strong nonlinearities, and the low ohmic losses characterizing high refractive-index materials in the visible/near-infrared (NIR) region of the spectrum. In this frame, AlGaAs nanoantennas demonstrated to be extremely efficient sources of second harmonic radiation. In particular, the nonlinear polarization of an optical system pumped at the anapole mode can be potentially boosted, due to both the strong dip in the scattering spectrum and the near-field enhancement, which are characteristic of this mode. Plasmonic nanostructures, on the other hand, remain the most promising solution to achieve strong local field confinement, especially in the NIR, where metals such as gold display relatively low losses. Results: We present a nonlinear hybrid antenna based on an AlGaAs nanopillar surrounded by a gold ring, which merges in a single platform the strong field confinement typically produced by plasmonic antennas with the high nonlinearity and low loss characteristics of dielectric nanoantennas. This platform allows enhancing the coupling of light to the nanopillar at coincidence with the anapole mode, hence boosting both second- and third-harmonic generation conversion efficiencies. More than one order of magnitude enhancement factors are measured for both processes with respect to the isolated structure. Conclusion: The present results reveal the possibility to achieve tuneable metamixers and higher resolution in nonlinear sensing and spectroscopy, by means of improved both pump coupling and emission efficiency due to the excitation of the anapole mode enhanced by the plasmonic nanoantenna.
Publisher: The Optical Society
Date: 22-11-2019
Publisher: American Physical Society (APS)
Date: 16-02-2017
Publisher: American Physical Society (APS)
Date: 12-02-2021
Publisher: Springer Science and Business Media LLC
Date: 15-05-2017
Abstract: A strong limitation of linear optical quantum computing is the probabilistic operation of two-quantum-bit gates based on the coalescence of indistinguishable photons. A route to deterministic operation is to exploit the single-photon nonlinearity of an atomic transition. Through engineering of the atom-photon interaction, phase shifters, photon filters and photon-photon gates have been demonstrated with natural atoms. Proofs of concept have been reported with semiconductor quantum dots, yet limited by inefficient atom-photon interfaces and dephasing. Here, we report a highly efficient single-photon filter based on a large optical nonlinearity at the single-photon level, in a near-optimal quantum-dot cavity interface. When probed with coherent light wavepackets, the device shows a record nonlinearity threshold around 0.3 ± 0.1 incident photons. We demonstrate that 80% of the directly reflected light intensity consists of a single-photon Fock state and that the two- and three-photon components are strongly suppressed compared with the single-photon one.
Publisher: American Chemical Society (ACS)
Date: 12-04-2019
Publisher: American Physical Society (APS)
Date: 28-03-2017
Publisher: Springer Science and Business Media LLC
Date: 03-08-2015
Abstract: Nano- and micromechanical resonators are the subject of research that aims to develop ultrasensitive mass sensors for spectrometry, chemical analysis and biomedical diagnosis. Unfortunately, their merits generally diminish in liquids because of an increased dissipation. The development of faster and lighter miniaturized devices would enable improved performances, provided the dissipation was controlled and novel techniques were available to drive and readout their minute displacement. Here we report a nano-optomechanical approach to this problem using miniature semiconductor disks. These devices combine a mechanical motion at high frequencies (gigahertz and above) with an ultralow mass (picograms) and a moderate dissipation in liquids. We show that high-sensitivity optical measurements allow their Brownian vibrations to be resolved directly, even in the most-dissipative liquids. We investigate their interaction with liquids of arbitrary properties, and analyse measurements in light of new models. Nano-optomechanical disks emerge as probes of rheological information of unprecedented sensitivity and speed, which opens up applications in sensing and fundamental science.
Publisher: The Optical Society
Date: 04-11-2019
Publisher: The Optical Society
Date: 22-07-2015
DOI: 10.1364/OE.23.019656
Publisher: American Physical Society (APS)
Date: 17-06-2021
Publisher: AIP Publishing
Date: 09-12-2013
DOI: 10.1063/1.4846515
Abstract: We report on optomechanical GaAs disk resonators with ultrahigh quality factor-frequency product Q×f. Disks standing on a simple pedestal exhibit GHz mechanical breathing modes attaining a Q×f of 1013 measured under vacuum at cryogenic temperature. Cl ing losses are found to be the dominant source of dissipation. An improved disk resonator geometry integrating a shield within the pedestal is then proposed, and its working principles and performances are investigated by numerical simulations. For dimensions compatible with fabrication constraints, the cl ing-loss-limited Q reaches 107–109 corresponding to Q×f equals 1016–1018. This shielded pedestal approach applies to any heterostructure presenting an acoustic mismatch.
Publisher: Springer Science and Business Media LLC
Date: 30-10-2020
DOI: 10.1038/S41467-020-19341-4
Abstract: Light states composed of multiple entangled photons—such as cluster states—are essential for developing and scaling-up quantum computing networks. Photonic cluster states can be obtained from single-photon sources and entangling gates, but so far this has only been done with probabilistic sources constrained to intrinsically low efficiencies, and an increasing hardware overhead. Here, we report the resource-efficient generation of polarization-encoded, in idually-addressable photons in linear cluster states occupying a single spatial mode. We employ a single entangling-gate in a fiber loop configuration to sequentially entangle an ever-growing stream of photons originating from the currently most efficient single-photon source technology—a semiconductor quantum dot. With this apparatus, we demonstrate the generation of linear cluster states up to four photons in a single-mode fiber. The reported architecture can be programmed for linear-cluster states of any number of photons, that are required for photonic one-way quantum computing schemes.
No related grants have been discovered for Aristide Lemaitre.