Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors
Résumé
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
Domaines
Matière Molle [cond-mat.soft] Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall] Arithmétique des ordinateurs Modélisation et simulation Traitement du signal et de l'image [eess.SP] Science des matériaux [cond-mat.mtrl-sci] Physique Quantique [quant-ph] Biophysique [physics.bio-ph] Chimie-Physique [physics.chem-ph] Physique Numérique [physics.comp-ph] Agrégats Moléculaires et Atomiques [physics.atm-clus]| Origine | Fichiers produits par l'(les) auteur(s) |
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