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HL: Fachverband Halbleiterphysik

HL 23: Ultra-fast phenomena

HL 23.10: Vortrag

Dienstag, 17. März 2020, 12:15–12:30, POT 112

Ultrafast long-range energy transport via light-matter coupling in organic semiconductor films — •Raj Pandya and Akshay Rao — Cavendish Laboratory, JJ Thomson Avenue, CB3 0HE, Cambridge, United Kingdom

Efficient energy transport over macroscopic length scales is highly desirable in organic semiconductors. Here, we show this can be achieved at room temperature in a range of chemically diverse, organic semiconductor thin films through strong light-matter coupling to form exciton-polaritons, despite the absence of an external cavity. We directly visualize energy transport via femtosecond transient absorption microscopy with sub-10 fs temporal and sub-10 nm spatial precision and find energy transport lengths of up to ~270 nm at effective velocities of up to ~5 x106 m s-1. We find additional evidence of strong light-matter coupling via peak splittings in the reflectivity spectra and emission from collective polariton states. These results and the design rules that follow will enable a new generation of organic optoelectronic and light harvesting devices based on robust cavity-free exciton-polaritons.