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

Raj PandyaRichard Y S ChenQifei GuJooyoung SungChristoph SchnedermannOluwafemi S OjambatiRohit ChikkaraddyJeffrey GormanGianni JacucciOlimpia D OnelliTom WillhammarDuncan N JohnstoneSean Michael CollinsPaul A MidgleyFlorian AurasTomi BaikieRahul JayaprakashFabrice MathevetRichard SoucekMatthew DuAntonios M AlvertisArjun AshokaSilvia VignoliniDavid G LidzeyJeremy J BaumbergRichard Henry FriendThierry BarisienLaurent LegrandAlex W ChinJoel Yuen-ZhouSemion K SaikinPhilipp KukuraAndrew J MusserAkshay Rao
Published in: Nature communications (2021)
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 × 106 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.
Keyphrases
  • room temperature
  • energy transfer
  • ionic liquid
  • high resolution
  • quantum dots
  • water soluble
  • minimally invasive
  • photodynamic therapy
  • mass spectrometry
  • density functional theory