Tunable intrinsic strong light–matter coupling in transition metal dichalcogenide nanoresonators

Abstract

Self-hybridizing structures based on transition metal dichalcogenides (TMDCs) are becoming promising candidates for the study of an intrinsic strong light–matter coupling because of the efficient mode overlap with much simplified geometries. However, realizing flexible tuning of intrinsic strong coupling in such TMDC-based structures is still challenging. Here, we propose a strategy for flexible tuning of the intrinsic strong light–matter coupling based on a bulk TMDC material. We report the first demonstration of the strong coupling of intrinsic excitons to whispering gallery modes (WGMs) supported by an all-TMDC nanocavity. Importantly, by simply controlling angles of incidence, a selective excitation of WGMs and an anapole can be realized, which enables a direct modulation of self-hybridized interactions from a bright WGM–exciton coupling to a dark anapole–exciton coupling. Our work is expected to provide unique opportunities for engineering a strong light–matter coupling and to open exciting avenues for highly integrated novel nanophotonic devices.