Anisotropic light-matter coupling and below-threshold excitation dynamics in an organic crystal microcavity

Organic semiconductors are promising candidates as platforms for room temperature polaritonic devices. An issue for practical implementation of organic polariton devices is the lowering of condensation threshold. Here we investigate anisotropic light-matter coupling characteristics in an organic crystal microcavity showing strong molecular orientation. Furthermore, the below-threshold excitation dynamics are investigated to clarify the spontaneous transition pathways from reservoir to polariton states. Time-resolved photoluminescence measurements reveal that photonic/excitonic hybrid transition processes coexist in the microcavity system. This finding provides valuable insights into a detailed understanding of polariton dynamics and help in the design of polaritonic devices showing a low-threshold condensed phase. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

Organic semiconductors show promise as platforms for room temperature polaritonic devices, but practical implementation requires lowering the condensation threshold. Anisotropic light-matter coupling characteristics in an organic crystal microcavity with strong molecular orientation were investigated, along with below-threshold excitation dynamics. It was found that photonic/excitonic hybrid transition processes coexist in the system, providing valuable insights into understanding polariton dynamics and designing devices with a low-threshold condensed phase.