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Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors

Abstract : Abstract Strong-coupling between excitons and confined photonic modes can lead to the formation of new quasi-particles termed exciton-polaritons which can display a range of interesting properties such as super-fluidity, ultrafast transport and Bose-Einstein condensation. Strong-coupling typically occurs when an excitonic material is confided in a dielectric or plasmonic microcavity. Here, we show polaritons can form at room temperature in a range of chemically diverse, organic semiconductor thin films, despite the absence of an external cavity. We find evidence of strong light-matter coupling via angle-dependent peak splittings in the reflectivity spectra of the materials and emission from collective polariton states. We additionally show exciton-polaritons are the primary photoexcitation in these organic materials by directly imaging their ultrafast (5 × 10 6 m s −1 ), ultralong (~270 nm) transport. These results open-up new fundamental physics and could enable a new generation of organic optoelectronic and light harvesting devices based on cavity-free exciton-polaritons
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https://hal.archives-ouvertes.fr/hal-03429501
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Submitted on : Monday, November 15, 2021 - 4:49:59 PM
Last modification on : Saturday, April 23, 2022 - 3:14:47 AM
Long-term archiving on: : Wednesday, February 16, 2022 - 9:07:26 PM

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Raj Pandya, Richard y S Chen, Qifei Gu, Jooyoung Sung, Christoph Schnedermann, et al.. Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors. Nature Communications, Nature Publishing Group, 2021, 12 (1), ⟨10.1038/s41467-021-26617-w⟩. ⟨hal-03429501⟩

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