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- Title
Optical polariton properties in ZnSe-based planar and pillar structured microcavities.
- Authors
Sebald, K.; Trichet, A.; Richard, M.; Dang, L.; Seyfried, M.; Klembt, S.; Kruse, C.; Hommel, D.
- 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.
- Subjects
POLARITONS; ZINC selenide; CAVITY resonators; ELECTRONIC excitation; EXCITON theory; LOW temperatures; DISPERSION (Chemistry); RELAXATION phenomena
- Publication
European Physical Journal B: Condensed Matter, 2011, Vol 84, Issue 3, p381
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/e2011-20551-9