Publications de François Morier-Genoud

Reservoir-induced decoherence of resonantly excited confined polaritons

Benoît Marie Joseph Deveaud, François Morier-Genoud, Daniel Oberli, Marcia Portella Oberli, Grégory Chilpéric Sallen, Claudéric Ouellet-Plamondon

We report on the effect of decoherence on polariton bistability. The polariton hysteresis loop is shown to collapse in a similar way when increasing the temperature or under nonresonant excitation power. The hysteresis upward threshold is pulled to lower e ...

Amer Physical Soc2017

Spatial multistability induced by cross interactions of confined polariton modes

Benoît Marie Joseph Deveaud, François Morier-Genoud, Daniel Oberli, Marcia Portella Oberli, Grégory Chilpéric Sallen, Claudéric Ouellet-Plamondon

We demonstrate the occurrence of spatial multistability using laterally confined microcavity exciton-polaritons. By coherently exciting with a blue detuned laser a series of confined polariton modes, we investigate the effects of multistability on the tran ...

Amer Physical Soc2016

Effect of a noisy driving field on a bistable polariton system

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Hadis Abbaspour, Stéphane Trebaol, Grégory Chilpéric Sallen

We report on the effect of noise on the characteristics of the bistable polariton emission system. The present experiment provides a time-resolved access to the polariton emission intensity. We evidence the noise-induced transitions between the two stable ...

American Physical Society2015

Analytical method for determining quantum well exciton properties in a magnetic field

Benoît Marie Joseph Deveaud, François Morier-Genoud, Barbara Pietka

We develop an analytical approximate method for determining the Bohr radii of Wannier-Mott excitons in thin quantum wells under the influence of magnetic field perpendicular to the quantum well plane. Our hybrid variational-perturbative method allows us to ...

American Physical Society2015

Spinor stochastic resonance

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Hadis Abbaspour, Stéphane Trebaol

We report on noise-induced spin ordering in a collective quasiparticle system: spinor stochastic resonance. Synergetic interplay of a polarization-modulated signal and a polarization noise allows us to switch coherently between the two metastable states of ...

American Physical Society2015

Stochastic Resonance in Collective Exciton-Polariton Excitations inside a GaAs Microcavity

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Hadis Abbaspour, Stéphane Trebaol

We report the first observation of stochastic resonance in confined exciton polaritons. We evidence this phenomena by tracking the polaritons behavior through two stochastic resonance quantifiers namely the spectral magnification factor and the signal-to-n ...

American Physical Society2014

Nonlinear relaxation and selective polychromatic lasing of confined polaritons

Benoît Marie Joseph Deveaud, François Morier-Genoud, Marcia Portella Oberli, Gabriele Grosso, Stéphane Trebaol

Polaritons have often been proposed as promising candidates for the realization of all-optical devices due to the easy manipulation and control of their density and spin. In this paper we present a relaxation mechanism for confined polaritons and its appli ...

Amer Physical Soc2014

Coherent Excitonic Coupling in an Asymmetric Double InGaAs Quantum Well Arises from Many-Body Effects

François Morier-Genoud, Gaël Nardin, Rohan Singh

We study an asymmetric double InGaAs quantum well using optical two-dimensional coherent spectroscopy. The collection of zero-quantum, one-quantum, and two-quantum two-dimensional spectra provides a unique and comprehensive picture of the double well coher ...

Amer Physical Soc2014

Polariton based all-optical spin device

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Roland Cerna

An all-optical spin device is based on spin multistability of trapped microactivity polaritons. ...

2013

Ultrafast tristable spin memory of a coherent polariton gas

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Marcia Portella Oberli, Roland Cerna

Non-linear interactions in coherent gases are not only at the origin of bright and dark solitons and superfluids; they also give rise to phenomena such as multistability, which hold great promise for the development of advanced photonic and spintronic devi ...

Nature Publishing Group2013

Influence of a nonradiative reservoir on polariton spin multistability

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Marcia Portella Oberli, Roland Cerna

In this work, we study the influence of the excitation conditions on power-dependent spin switching and spin multistability of exciton polaritons in planar semiconductor microcavities. We obtain experimental evidence for the influence of a reservoir of non ...

American Physical Society2013

Magnetic Field Induced Redistribution of Exciton-Polariton Density on Confined Modes

Benoît Marie Joseph Deveaud, François Morier-Genoud, Gaël Nardin, Barbara Pietka

The influence of magnetic field on confined exciton-polariton modes inside a semiconductor microcavity is discussed. The three-dimensional confinement for exciton-polaritons is achieved by the mesa structures confining the photonic part of polaritons. We o ...

Polish Acad Sciences Inst Physics2012

Collisional damping of dipole oscillations in a trapped polariton gas

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Marcia Portella Oberli, Roland Cerna, Barbara Pietka

We study the relaxation dynamics of a trapped polariton gas in the nonlinear regime. We excite the three lowest energy states of the system and observe the time evolution of the polariton density in the momentum space. At a low excitation power, the dynami ...

2011

Three-Dimensional Multiple-Order Twinning of Self-Catalyzed GaAs Nanowires on Si Substrates

François Morier-Genoud, Gabriel Mugny, Anna Fontcuberta i Morral, Martin Heiss, Emanuele Uccelli, Eleonora Russo

In this paper we introduce a new paradigm for nanowire growth that explains the unwanted appearance of parasitic nonvertical nanowires. With a crystal structure polarization analysis of the initial stages of GaAs nanowire growth on Si substrates, we demons ...

American Chemical Society2011

Spin-to-orbital angular momentum conversion in semiconductor microcavities

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Konstantinos Lagoudakis, Roland Cerna, Timothy Chi Hin Liew, Francesco Manni

We experimentally demonstrate a technique for the generation of optical beams carrying orbital angular momentum using a planar semiconductor microcavity. Despite being isotropic systems with no structural gyrotropy, semiconductor microcavities, because of ...

2011

Coherent oscillations between orbital angular momentum polariton states in an elliptic resonator

Benoît Marie Joseph Deveaud, François Morier-Genoud, Gaël Nardin, Barbara Pietka

We optically excited the eigenmodes of an elliptic resonator in a semiconductor microcavity. Using a pulsed excitation, we created a superposition of eigenmodes, and imaged the temporal evolution of the coherent emission pattern. A semiconductor quantum we ...

2011

Soliton Instabilities and Vortex Street Formation in a Polariton Quantum Fluid

Benoît Marie Joseph Deveaud, François Morier-Genoud, Gaël Nardin, Gabriele Grosso

Exciton polaritons have been shown to be an optimal system in order to investigate the properties of bosonic quantum fluids. We report here on the observation of dark solitons in the wake of engineered circular obstacles and their decay into streets of qua ...

American Physical Society2011

Spatial dynamics of confined semiconductor microcavity polaritons

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Marcia Portella Oberli, Roland Cerna

We report on the dynamics of confined zero-dimensional polaritons. We excite resonantly discrete polariton states optically with a tailored picosecond laser pulse and observe their emission time resolved in the two-dimensional k space or real space. We are ...

2010

Probability density tomography of microcavity polaritons confined in cylindrical traps of various sizes

Benoît Marie Joseph Deveaud, François Morier-Genoud, Taofiq Paraïso, Gaël Nardin, Ounsi El Daïf, Roland Cerna, Barbara Pietka

We present the optical tomography of the probability density of microcavity polaritons, confined in three dimensions by cylindrical traps of various sizes. Collecting the photoluminescence emitted by the quasimodes under continuous nonresonant laser excita ...

Elsevier2010

Phase-resolved imaging of confined exciton-polariton wave functions in elliptical traps

Benoît Marie Joseph Deveaud, François Morier-Genoud, Gaël Nardin, Barbara Pietka

We study the wave functions of exciton polaritons trapped in the elliptical traps of a patterned microcavity. A homodyne detection setup with numerical off-axis filtering allows us to retrieve the amplitude and the phase of the wave functions. Doublet stat ...

2010