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Effets non linéaires et quantiques dans les microcavités semi-conductrices

Abstract : We study semiconductor microcavities with embedded quantum wells. In such devices the strong coupling regime between the resonant cavity mode and the quantum-well excitons can be achieved. The optical resonances show a doublet structure which is interpreted in terms of mixed exciton-photon modes called cavity polaritons. This work is devoted to the optical nonlinearities coming from Coulomb interactions between excitons and their influence on the quantum fluctuations of the light field.
We show that under resonant excitation at normal incidence, nonlinear effects can be described by a degenerate polariton four-wave mixing providing a Kerr-like nonlinear term. A detailed theoretical study shows that a noise reduction of the reflected field can be achieved. Experimental studies were conducted on a microcavity cooled at 4K and excited by a cw quasi-monochromatic laser. The noise of the outgoing field is measured using a homodyne detection setup. The results are in good qualitative agreement with the model. We observe a bistable behavior at high excitation intensity. We demonstrate the phase dependence of the emission, proving the existence of a coherent nonlinear effect. Noise reduction below the thermal noise coming from quasi-resonant luminescence is also evidenced.
Finally, we conducted a theoretical study of another configuration where the angle of incidence is chosen in order to maximize the efficacy of the non-degenerate polariton four-wave mixing process. Then he system shows strong similarities with a non-degenerate optical parametric oscillator. We show that the intensities of the " signal " and " idler " beams are quantum correlated slightly above the parametric oscillation threshold.
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Contributor : Jean-Philippe Karr <>
Submitted on : Friday, March 8, 2002 - 4:31:53 PM
Last modification on : Thursday, December 10, 2020 - 12:37:01 PM
Long-term archiving on: : Tuesday, September 11, 2012 - 5:00:57 PM


  • HAL Id : tel-00001199, version 1


Jean-Philippe Karr. Effets non linéaires et quantiques dans les microcavités semi-conductrices. Physique Atomique [physics.atom-ph]. Université Pierre et Marie Curie - Paris VI, 2001. Français. ⟨tel-00001199⟩



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