Strongly coupled exciton-polaritons can be observed in a wide variety of systems and exhibit remarkable properties due to their small mass, compared to that of electrons, and their bosonic nature. This allows to study quantum condensates and can be exploited for photonic integrated circuits. For the latter one, the small propagation length of the polaritons in microcavities often comprises a limiting factor. By using evanescent guided modes as the photonic component instead of cavity photons, the polaritons inherit longer lifetimes. In this work, we report on the observation of propagating polaritons, consisting of interacting Bloch surface waves and excitons in ZnO, at room temperature and find energy dependent propagation lengths of up to 100 μm. These results open the path to applying Bloch polaritons in on-chip polaritonic devices requiring macroscopic propagation at or above room temperature.

中文翻译：

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Bloch 表面波极化激元在 ZnO 中的长距离传播


强耦合激子-极化激元可以在各种各样的系统中观察到，并且由于与电子相比质量小，并且具有玻色子性质，因此表现出显着的特性。这允许研究量子凝聚态，并可用于光子集成电路。对于后者，极化激元在微腔中的小传播长度通常是一个限制因素。通过使用倏逝的引导模式作为光子分量而不是腔光子，极化激元继承了更长的寿命。在这项工作中，我们报告了在室温下对传播极化激元的观察，该极化激元由相互作用的 Bloch 表面波和 ZnO 中的激子组成，并发现能量依赖性传播长度高达 100 μm。这些结果为在需要在室温或室温以上进行宏观传播的片上极化激元器件中应用 Bloch 极化激元开辟了道路。