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

Raj Pandya, Richard Y.S. Chen, Qifei Gu, Jooyoung Sung, Christoph Schnedermann, Oluwafemi S. Ojambati, Rohit Chikkaraddy, Jeffrey Gorman, Gianni Jacucci, Olimpia D. Onelli, Tom Willhammar, Duncan N. Johnstone, Sean M. Collins, Paul A. Midgley, Florian Auras, Tomi Baikie, Rahul Jayaprakash, Fabrice Mathevet, Richard Soucek, Matthew DuAntonios M. Alvertis, Arjun Ashoka, Silvia Vignolini, David G. Lidzey, Jeremy J. Baumberg, Richard H. Friend, Thierry Barisien, Laurent Legrand, Alex W. Chin, Joel Yuen-Zhou, Semion K. Saikin, Philipp Kukura, Andrew J. Musser, Akshay Rao*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

31 Citations (Scopus)
19 Downloads (Pure)

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 × 106m 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

Original languageEnglish
Article number6519
JournalNature communications
Volume12
Issue number1
DOIs
Publication statusPublished - Dec 2021
Externally publishedYes

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