General Physics Colloquium - Jacqueline Bloch: 'Quantum fluids in semiconductor microcavities'
Oplysninger om arrangementet
General Physics Colloquium
Quantum fluids in semiconductor microcavities
Jacqueline Bloch, Laboratoire de Photonique et de Nanostructures, LPN/CNRS, Route de Nozay, 91460 Marcoussis, France, Jacqueline.firstname.lastname@example.org
At the frontier between non-linear optics and the physics of Bose Einstein condensation, semiconductor microcavities opened a new research field, both for fundamental studies of bosonic quantum fluids, and for the development of new devices for all optical information processing.
Optical properties of semiconductor microcavities are indeed governed by bosonic quasi-particles named cavity polaritons, which are light-matter mixed states. Cavity polaritons propagate like photons, but interact strongly with their environment via their matter component.
Our group at Laboratoire de Photonique and Nanostructures has developed these last years, thanks to the technological facilities available in the LPN clean room, state of the art microcavities and photonic circuits.
After a general introduction on cavity polaritons, I will review recent experimental works performed on these photonic circuits. I will show how we can generate polariton flows which propagate over macroscopic distances (mm) while preserving their spatial and temporal coherence. These polaritons can be optically manipulated, trapped and re-amplified along their propagation. These recently published properties are the basic ingredients for future development of polaritonic devices. I will describe recently implemented polariton devices: a polariton interferometer and a non-linear resonant tunneling polariton diode. Finally I will illustrate the crucial role of polariton interactions by presenting self-trapping experiments in coupled cavities.
I will conclude with some perspectives opened by these new polariton devices.
 Spontaneous formation and optical manipulation of extended polariton condensates , E. Wertz, et al., Nat. Phys. 6, 860 (2010); Interactions in Confined Polariton Condensates , L. Ferrier, et al., Phys. Rev. Lett. 106, 126401 (2011);  Backscattering suppression in supersonic 1D polariton condensates , D. Tanese, et al., Phys. Rev. Lett. 108, 036405 (2012); Polariton condensation in photonic molecules, M. Galbiati, et al., Phys. Rev. Lett. 108, 126403 (2012);  Propagation and Amplification Dynamics of 1D Polariton Condensates, E. Wertz et al., Phys. Rev. Lett. 109, 216404 (2012)  Macroscopic quantum self-trapping and Josephson oscillations of exciton-polaritons, M. Abbarchi et al., arXiv:1212.5467 (Nature Physics under Review); Giant phase modulation in a Mach-Zehnder exciton-polariton interferometer, C. Sturm et al., submitted.
Coffee/tea and cake will be served at 3 p.m.