Tuning the exciton-photon coupling in a strongly coupled organic microcavity containing an optical wedge

Abstract

We have fabricated strongly coupled organic microcavities by laminating an organic thin film between two dielectric mirrors. The organic film consisted of J aggregates of a cyanine dye suspended in a transparent matrix. By applying a nonuniform force across the substrate during lamination, the optical path length of the cavity changed linearly across the sample, thereby forming a wedge. This enabled cavity mode tuning by changing the position of the incident light beam with respect to the surface of the cavity. Transmission measurements are employed to investigate strong exciton-photon coupling in such microcavities. The results show a well-resolved anti-crossing behavior, which is confirmed by numerical analysis.