Strong Exciton-Photon Coupling in a Nanographene Filled Microcavity

TL;DR

This paper demonstrates strong exciton-photon coupling in a nanographene-filled microcavity, revealing significant coupling energies and polariton formation at room temperature, which could impact optoelectronic device development.

Contribution

It reports the first observation of strong exciton-photon coupling in a nanographene-based microcavity at room temperature, with detailed measurements of coupling energies and polariton dynamics.

Findings

Coupling energies of 104 meV and 40 meV for electronic and vibrational transitions.

Observation of polariton population distribution matching DBOV emission.

Room temperature strong coupling achieved with nanographene in a microcavity.

Abstract

Dibenzo[\emph{hi,st}]ovalene (DBOV) - a quasi-zero-dimensional `nanographene' - displays strong, narrow, and well-defined optical-absorption transitions at room temperature. On placing a DBOV-doped polymer film into an optical microcavity, we demonstrate strong coupling of the \textbf{0 $\rightarrow$ 0'} electronic and \textbf{0 $\rightarrow$ 1'} vibrational transitions to a confined cavity mode, with coupling energies of 104 meV and 40 meV, respectively. Photoluminescence measurements indicate that the polariton population is distributed between the lower and middle polariton branches at energies approximately coincident with the emission of the DBOV, indicating polariton population via an optical pumping mechanism.