Coherent emission from a disordered organic semiconductor induced by strong coupling with surface plasmons

TL;DR

This paper demonstrates that strong coupling between disordered molecular emitters and surface plasmons creates spatially coherent hybrid states, enabling coherent emission over micrometer scales, unlike in weak coupling regimes.

Contribution

It reveals that strong coupling induces spatial coherence in disordered organic semiconductors through hybridization with surface plasmons, a novel insight into plasmon-molecule interactions.

Findings

Coherent emission observed over several microns.

Coherence absent in weak coupling regime.

Hybrid states extend spatially due to strong coupling.

Abstract

In this Letter we show that the strong coupling between a disordered set of molecular emitters and surface plasmons leads to the formation of spatially coherent hybrid states extended on acroscopic distances. Young type interferometric experiments performed on a system of J-aggregated dyes spread on a silver layer evidence the coherent emission from different molecular emitters separated by several microns. The coherence is absent in systems in the weak coupling regime demonstrating the key role of the hybridization of the molecules with the plasmon.