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

Raj Pandya(University of Cambridge), Richard Y. S. Chen(University of Cambridge), Qifei Gu(University of Cambridge), Jooyoung Sung(University of Cambridge), Christoph Schnedermann(University of Cambridge), Oluwafemi Stephen Ojambati(University of Cambridge), Rohit Chikkaraddy(University of Cambridge), J.A. Gorman(University of Cambridge), Gianni Jacucci(University of Cambridge), Olimpia D. Onelli(University of Cambridge), Tom Willhammar(Stockholm University), Duncan N. Johnstone(University of Cambridge), Sean M. Collins(University of Cambridge), Paul A. Midgley(University of Cambridge), Florian Auras(University of Cambridge), Tomi K. Baikie(University of Cambridge), Rahul Jayaprakash(University of Sheffield), Fabrice Mathevet(Sorbonne Université), Richard Soucek(Sorbonne Université), Matthew Du(San Diego State University), Antonios M. Alvertis(University of Cambridge), Arjun Ashoka(University of Cambridge), Silvia Vignolini(University of Cambridge), David G. Lidzey(University of Sheffield), Jeremy J. Baumberg(University of Cambridge), Richard H. Friend(University of Cambridge), Thierry Barisien(Sorbonne Université), Laurent Legrand(Sorbonne Université), Alex W. Chin(Sorbonne Université), Joel Yuen-Zhou(San Diego State University), Semion K. Saikin(Harvard University), Philipp Kukura(University of Oxford), Andrew J. Musser(Cornell University), Akshay Rao(University of Cambridge)
Nature Communications
November 11, 2021
10.1038/s41467-021-26617-w
Cited by 77Open Access
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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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