室温下ZnO微腔中布拉格模和腔模极化激元的弛豫和发射
Relaxation and emission of Bragg-mode and cavity-mode polaritons in a ZnO microcavity at room temperature
摘要：
通过室温光致发光和反射率实验研究了ZnO微腔中的强耦合机制。在室温下，激子与腔模和第一布拉格模的同时强耦合被证明。极化激元弛豫是激发密度的函数。在布拉格模式极化激元分支中存在弛豫瓶颈。在强激发密度下，它被部分破坏，因此来自该分支的发射占主导地位的腔模极化激元的发射。
英文摘要：
The strong coupling regime in a ZnO microcavity is investigated through room temperature photoluminescence and reflectivity experiments. The simultaneous strong coupling of excitons to the cavity mode and the first Bragg mode is demonstrated at room temperature. The polariton relaxation is followed as a function of the excitation density. A relaxation bottleneck is evidenced in the Bragg-mode polariton branch. It is partly broken under strong excitation density, so that the emission from this branch dominates the one from cavity-mode polaritons.
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