The spin dynamics of cavity polaritons, in the non-linear regime, present a novel and striking behaviour of the degree of polarization of photoluminescence. It reaches its maximum value at a finite time after excitation with a light pulse, and is strongly influenced by the exciton-cavity detuning. I
Polariton dynamics in disordered microcavities
β Scribed by P. Michetti; G.C. La Rocca
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 227 KB
- Volume
- 40
- Category
- Article
- ISSN
- 1386-9477
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β¦ Synopsis
The behaviour of cavity polaritons is strongly affected by disorder scattering in traditional inorganic semiconductor microcavities and, much more, in organic semiconductor microcavities. In the presence of disorder coherent cavity polaritons having a well defined in-plane wavevector coexist with incoherent states having a localized character. We here study through a numerical simulation of a onedimensional disordered microcavity in the strong coupling regime, the polariton wavefunction character and the dynamical behaviour of excited wave packets. A detailed microscopic picture is obtained which substantiates the coexistence of both propagating and localized states over time and length scales of experimental relevance.
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The directional resonant secondary emission of a semiconductor microcavity is investigated. Exciting the lower polariton branch, a directional emission on a ring is observed. The coherent emission ring shows a reduction of its angular width for increasing time, a direct evidence for the timeenergy u
We present a full analysis of exciton dynamics in a GaAs Ξ»/2 bulk microcavity following excitation by ultrafast laser pulses. Coherent dynamics was probed by means of an interferometric technique; beating and dephasing times were studied for various excitation intensities. At high incident power, po