Andreas Löffler

TL;DR: In this paper, the power-dependent photoluminescence spectra from a strongly coupled quantum dot-cavity system using a quantum master equation technique that accounts for incoherent pumping, stimulated emission, pure dephasing, and fermion or boson statistics were investigated.

Abstract: The authors report complementary investigations on the coherence properties of spontaneous and stimulated emission from (In,Ga)As∕GaAs quantum-dot-based high-quality semiconductor micropillar cavities. Low temperature microphotoluminescence measurements on an elliptically shaped micropillar revealed a clear polarization splitting (ΔE∼45μeV) of its fundamental mode. Full conformity is found with an oscillatory behavior observed in corresponding g(1)(τ) first-order field correlation measurements. In addition, power-dependent g(1)(τ) series on a single polarization component of the lasing mode have systematically revealed a strong coherence time increase from τc∼25to∼430ps, which traces the change of emission characteristics from thermal to coherent light.

TL;DR: A strongly coupled quantum dot-micropillar cavity system is studied under variation of the excitation power, which yields a transition from strong coupling towards weak coupling which is mainly attributed to an exciton-photon coupling constant decrease.

TL;DR: In this article, a combined experimental and theoretical study of the polarization-dependent strong-coupling regime between two quantum dots and an asymmetric micropillar cavity is presented. And the authors apply an analytical photon Green function approach that successfully reproduces the qualitative features of their experimental data.

TL;DR: In this paper, a systematic experimental and theoretical study of first-order coherence properties of high-end quantum-dot micropillar lasers is presented, where a nonlinear increase in the coherence length is found in the transition regime from spontaneous to dominantly stimulated emission.