J聚集体微腔中激子-声子散射和光激发动力学
Exciton-phonon scattering and photo-excitation dynamics in J-aggregate microcavities
摘要：
我们已经开发了一个模型占的光激发动力学和光致发光的强耦合J-聚集体微腔。我们的模型是基于J-聚集膜的描述作为一个无序的Frenkel激子系统中，由于存在的分子振动的热浴松弛发生。在强耦合微腔中，形成激子-极化激元，混合超辐射激子和腔光子。计算了连续波非共振泵浦下微腔的稳态光致发光。精确地再现了实验上、下极化激元分支之间的光致发光强度比。特别是热激活的光致发光强度比和拉比分裂的依赖性是一个后果的瓶颈在放松，发生在底部的激子水库。本文研究了激子衰变的辐射通道和弛豫过程中活跃的一组特殊的离散光学分子振动的影响。
英文摘要：
We have developed a model accounting for the photo-excitation dynamics and the photoluminescence of strongly coupled J-aggregate microcavities. Our model is based on a description of the J-aggregate film as a disordered Frenkel exciton system in which relaxation occurs due to the presence of a thermal bath of molecular vibrations. In a strongly coupled microcavity exciton-polaritons are formed, mixing superradiant excitons and cavity photons. The calculation of the microcavity steady-state photoluminescence, following a CW non resonant pumping, is carried out. The experimental photoluminescence intensity ratio between upper and lower polariton branches is accurately reproduced. In particular both thermal activation of the photoluminescence intensity ratio and its Rabi splitting dependence are a consequence of the bottleneck in the relaxation, occurring at the bottom of the excitonic reservoir. The effects due to radiative channels of decay of excitons and to the presence of a paritticular set of discrete optical molecular vibrations active in relaxation processes are investigared.
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