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Dynamics of Interactions of Confined Microcavity Polaritons

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The Bogoliubov transformation of a polariton quantum fluid has recently been revealed in the four-wave mixing response of a driven microcavity polariton gas. In this work, we investigate the modifications that the dual nature of microcavity polaritons prod ...

American Physical Society2012

On the condensation of polaritons

Benoît Marie Joseph Deveaud

Bose-Einstein condensates (BECs), the "fifth state of matter," have in fact been discovered by chance both in liquid helium and in superconductors. Since these early encounters, BECs have been sought for, both in atom vapors and in solids. Here we report o ...

2012

On Zero-Dimensional Exciton-Polaritons

Roland Cerna

Microcavity exciton-polaritons are half-matter half-light quasiparticles with outstanding properties. This offers a great way to access and control fundamental excitations in a solid by simple optical means. Therefore, apart from their importance in fundam ...

EPFL2011

Nonlinear Spectroscopy of a Dissipative Polariton Quantum Fluid

Verena Kohnle

After the observation of Bose-Einstein condensation in the solid state in 2006 and the demonstration on its superfluid character in 2009 the interest for the demonstration of the underlying elementary excitations – the Bogoliubov excitations – was growing. ...

EPFL2011

In this PhD thesis, new imaging techniques have been developed in order to explore the physics of semiconductor microcavities. In these structures, composite bosons called exciton polaritons are the result of strong coupling between the cavity mode and qua ...

EPFL2011

Polaritonic devices

Timothy Chi Hin Liew

We review the current hopes for applications of exciton-polaritons in semiconductor microcavities. These quasi-particles have become distinguished in recent years for a variety of different effects including Bose-Einstein condensation, ballistic spin curre ...

2011

All-optical control of the quantum flow of a polariton condensate

Romuald Houdré, Cristiano Ciuti

Although photons in vacuum are massless particles that do not appreciably interact with each other, significant interactions appear in suitable nonlinear media, leading to hydrodynamic behaviours typical of quantum fluids(1-6). Here, we show the generation ...

2011

Soliton Instabilities and Vortex Street Formation in a Polariton Quantum Fluid

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

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

Polariton lasing in a hybrid bulk ZnO microcavity

Nicolas Grandjean, Raphaël Butté, Jacques Levrat, Georg Rossbach

We demonstrate polariton lasing in a bulk ZnO planar microcavity under non-resonant optical pumping at a small negative detuning (delta similar to -1/6 the 130 meV vacuum Rabi splitting) and a temperature of 120 K. The strong coupling regime is maintained ...

2011

Collisional damping of dipole oscillations in a trapped polariton gas

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

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