Optical polariton properties in ZnSe-based planar and pillar structured microcavities |
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Authors: | K. Sebald A. Trichet M. Richard L. S. Dang M. Seyfried S. Klembt C. Kruse D. Hommel |
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Affiliation: | 1.Semiconductor Optics, Institute of Solid State Physics,University of Bremen,Bremen,Germany;2.CEA-CNRS-UJF group Nanophysique et Semiconducteurs, Institut Néel,Grenoble,France;3.Semiconductor Epitaxy, Institute of Solid State Physics,University of Bremen,Bremen,Germany |
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Abstract: | Strong coupling is demonstrated in monolithic ZnSe-based microcavities. Under nonresonant excitation the polariton dispersion has been investigated in dependence on the photon-exciton detuning for different excitation densities at low temperatures. For zero detuning indications of a polariton lasing threshold are observed like a k-space and energy dispersion narrowing of the lower polariton branch with increasing excitation density. Furthermore, it is observed that this effect is hampered for measurements at negative detunings as a result of the less effective polariton relaxation to the ground state. Latter results in the formation of a discrete polariton distribution at finite k values as known for the polariton bottleneck. In order to investigate the influence of a three-dimensional optical confinement on the polariton relaxation, pillar structured microcavities were fabricated. The formation of discrete polariton states in the k-space distribution is observed. Furthermore, indications for a softening of the k-conservation arising from the structural confinement are found leading to a more effective polariton relaxation. This process would be beneficial for the realization of efficient polariton lasing processes. |
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