Journal
ADVANCED OPTICAL MATERIALS
Volume 9, Issue 22, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adom.202101048
Keywords
exciton-polaritons; liquid crystals; microcavities; molecular orientation; polariton relaxation
Categories
Funding
- CNRS (PICS), France [8085]
- JSPS KAKENHI [JP17H06375, JP20H05106]
- Canada Research Chairs Program
- JSPS
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By controlling the orientation of organic molecules, the interaction between excitons and photons can be significantly enhanced, leading to a reduction in the condensation threshold of polariton BECs. This provides a promising strategy for realizing low-threshold polariton BEC systems and electrically driven polariton BECs.
Exciton-polaritons, in which the electronic state of an excited organic molecule and a photonic state are strongly coupled, can form a Bose-Einstein condensate (BEC) at room temperature. However, so far, the reported thresholds of organic polariton BECs under optical excitation are as high as P-th = 11-500 mu J cm(-2). One route toward lowering the condensation threshold is to increase the Rabi energy by aligning the molecular transition dipole moments. In this report, it is demonstrated that control of the orientation of a perylene-based discotic dye, which is able to self-organize in mesogenic columnar structures, can significantly enhance exciton-photon interaction and polariton relaxation rate in optical cavities. These results show the importance of the molecular orientation for strong light-matter interactions and provide a promising strategy toward the realization of an organic low threshold polariton BEC system and electrically driven organic polariton BEC.
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