A5013693712- Semiconductor Quantum Structures and Devices
- Photonic and Optical Devices
- Strong Light-Matter Interactions
- Semiconductor Lasers and Optical Devices
- Quantum and electron transport phenomena
- Advanced Fiber Laser Technologies
- Semiconductor materials and devices
- Thermal Radiation and Cooling Technologies
- Nanowire Synthesis and Applications
- Photorefractive and Nonlinear Optics
- solar cell performance optimization
- Chalcogenide Semiconductor Thin Films
- Mechanical and Optical Resonators
- Photonic Crystals and Applications
- Plasmonic and Surface Plasmon Research
- Advanced biosensing and bioanalysis techniques
- Semiconductor materials and interfaces
- Magnetic properties of thin films
- Electrochemical Analysis and Applications
- Quantum Dots Synthesis And Properties
- Silicon and Solar Cell Technologies
- TiO2 Photocatalysis and Solar Cells
- Quantum Electrodynamics and Casimir Effect
- Integrated Circuits and Semiconductor Failure Analysis
- Biosensors and Analytical Detection
Fonctions Optiques pour les Technologies de l’information
2015-2024
Institut National des Sciences Appliquées de Rennes
2013-2024
Université de Rennes
2016-2024
Centre National de la Recherche Scientifique
2015-2024
Foton Motors (China)
2013-2022
Université Rennes 2
2019
Centre d’Élaboration de Matériaux et d’Études Structurales
2016
École Polytechnique Fédérale de Lausanne
2007-2015
Université Européenne de Bretagne
2012-2013
CEA Grenoble
2005-2009
The magnetic state of a single ion (Mn2+) embedded in an individual quantum dot is optically probed using microspectroscopy. fine structure confined exciton the exchange field Mn2+ (S=5/2) analyzed detail. exciton-Mn2+ interaction shifts energy depending on spin component and six emission lines are observed at zero field. Magneto-optic measurements reveal that intensities both circular polarizations controlled by distribution imposed with exciton, field, effective manganese temperature which...
We analyze the optical emission of single II-VI quantum dots containing 0 or 1 magnetic atom (manganese) and a controlled number carriers (0, $\ifmmode\pm\else\textpm\fi{}1$ electron). The these presents large degree linear polarization. This polarization is attributed to valence-band mixing we show that in nonmagnetic combining both shape anisotropy an anisotropic in-plane strain distribution, direction exciton are by interplay between electron-hole (e-h) exchange interaction. Similarly,...
We report on the reversible electrical control of magnetic properties a single Mn atom in an individual quantum dot. Our device permits us to prepare dot states with three different electric charges, 0, +1e, and -1e which result dramatically spin properties, as revealed by photoluminescence. Whereas neutral configuration is paramagnetic, electron-doped are rotationally invariant hole-doped spins quantized along growth direction.
Exciton polaritons have been shown to be an optimal system in order investigate the properties of bosonic quantum fluids. We report here on observation dark solitons wake engineered circular obstacles and their decay into streets quantized vortices. Our experiments provide a time-resolved access polariton phase density, which allows for quantitative study instabilities freely evolving polaritons. The is quantified identified as effect disorder-induced transverse perturbations dissipative gas.
Using an angle-resolved heterodyne four-wave-mixing technique, we probe the low momentum excitation spectrum of a coherent polariton gas. The experimental results are well captured by Bogoliubov transformation which describes transition from single particle excitations normal fluid to soundlike superfluid. In dense gas, find all characteristics transformation, i.e., positive and negative energy branch with respect gas at rest, shapes for dispersion, intensity, linewidth ratio between two...
Photoinduced electrochemiluminescence (PECL) allows the electrochemically assisted conversion of low-energy photons into high-energy at an electrode surface. This concept is expected to have important implications, however, it dramatically limited by stability surface, impeding future developments. Here, a series metal-insulator-semiconductor (MIS) junctions, using photoactive n-type Si (n-Si) as light absorber covered few-nanometer-thick protective SiOx /metal (SiOx /M, with M=Ru, Pt, and...
The emission spectra of individual self-assembled quantum dots containing a single magnetic Mn atom differ strongly from dot to dot. differences are explained by the influence system geometry, specifically in-plane asymmetry and position atom. Depending on both these parameters, one has different characteristic features which either reveal or hide spin state observed behavior in zero field under can be quantitatively interplay between exciton-manganese exchange interaction (dependent...
The influence of the number confined carriers on spin splitting a single magnetic ion $({\mathrm{Mn}}^{2+})$ embedded in semiconductor quantum dot is evidenced. Investigating both biexciton and exciton transitions same Mn-doped dot, we analyze impact Mn-exciton exchange interaction fine structure emission. A electron-hole pair enough to induce spontaneous exciton-Mn system. injection second cancels with Mn significantly reduced. detailed analysis biexciton-Mn reveals that carriers' orbital...
The Bogoliubov transformation of a polariton quantum fluid has recently been revealed in the four-wave mixing response driven microcavity gas. In this work, we investigate modifications that dual nature polaritons produce on excitations particular half-light--half-matter fluid. We discuss character lower superfluid when it coexists with upper polaritons. show unique effects resulting from interplay between decay and such as modification dispersion or slowing down dynamics.
Using angle-resolved Raman spectroscopy, we show that a resonantly excited ground-state exciton-polariton fluid behaves like nonequilibrium coolant for its host solid-state semiconductor microcavity. With this optical technique, obtain detailed measurement of the thermal fluxes generated by pumped polaritons. We thus find maximum cooling power cryostat temperature 50 K and below where is usually suppressed, identify participation an ultrafast mechanism. also character polaritons constitutes...
Two-dimensional Fourier transform (2DFT) spectroscopy is a cutting-edge technique to investigate nonlinear many-body physics in semiconductor nanostructures. This paper reports an experimental and theoretical study of 2DFT on high-quality GaAs-based microcavity gain understanding polariton self-interactions cross-interactions their effects the 2D spectra.
Here we clarify the central role of miscut during group III-V/group IV crystal growth. We show that impacts initial antiphase domain distribution, with two distinct nucleation-driven (miscut typically >1\ifmmode^\circ\else\textdegree\fi{}) and terraces-driven 0.1\ifmmode^\circ\else\textdegree\fi{}) regimes. It is then inferred how distribution mean phase lateral length are affected by miscut. An experimental confirmation given through comparison distributions in GaP GaSb/AlSb samples grown...
We analyzed the photoluminescence intermittency generated by a single paramagnetic spin localized in an individual semiconductor quantum dot. The statistics of photons emitted dot reflect fluctuations interacting with injected carriers. Photon correlation measurements, which are reported here, reveal unique signatures these fluctuations. A phenomenological model is proposed to quantitatively describe observations, allowing measurement dynamics magnetic atom at zero field. These results...
We experimentally demonstrate a technique for the generation of optical beams carrying orbital angular momentum using planar semiconductor microcavity. Despite being isotropic systems with no structural gyrotropy, microcavities, because transverse-electric--transverse-magnetic polarization splitting that they feature, allow conversion circular an incoming laser beam into transmitted light field. The process implies formation topological entities, pair vortices, in intracavity
A new process to produce orientation-patterned gallium phosphide (OP-GaP) on GaAs with almost perfectly parallel domain boundaries is presented. Taking advantage of the chemical selectivity between phosphides and arsenides, OP-GaP processed into suspended shallow-ridge waveguides. Efficient second-harmonic generation from telecom wavelengths achieved in both Type-I Type-II polarisation configurations. The highest observed conversion efficiency 200% W–1 cm–2, a bandwidth 2.67 nm 1 mm-long...
ConspectusElectrochemiluminescence (ECL) is the electrochemical generation of light. It involves an interfacial charge transfer that produces excited state a luminophore at electrode surface. ECL powerful readout method widely employed for immunoassays and clinical diagnostics progressively evolving into microscopy technique. On other hand, photoelectrochemistry illuminated semiconductors field research deals with photogenerated carriers solid-liquid interface. This concept offers several...
Control of the wave function confined microcavity polaritons is demonstrated experimentally and theoretically by means tailored resonant optical excitation. Three dimensional confinement achieved etching mesas on top spacer layer. Resonant excitation with a continuous-wave laser locks phase discrete polariton states to laser. By tuning energy momentum laser, we achieve precise control pattern function. This an efficient direct way for quantum electronic excitations in solid.
Polariton fluids have revealed huge potentialities in order to investigate the properties of bosonic at quantum scale. Among those properties, opportunity create dark as well bright solitons has been demonstrated recently. In present experiments, we image formation dynamics oblique solitons. They nucleate wake an engineered attractive potential that perturbs polariton fluid. Thanks time and phase measurements, assess quantitatively process. The velocity is observed increase with increasing...
Gallium phosphide-on-insulator emerged recently as a promising platform for integrated nonlinear photonics due to its intrinsic material properties. However, current integration solutions, using direct die-to-wafer bonding, do not support spatially localized with CMOS circuits which induce large and expensive footprint need. Here we demonstrate the transfer of gallium phosphide layers an oxidized silicon wafer micro-transfer printing new approach versatile future (hybrid) integration. Using...