Strong coupling of Fabry-Pérot cavity mode, anapole, and exciton supported by an optical cavity with heterogeneous nano-optical metasurfaces
Junjie Li, Cheng Yang, Wei Liu, Xiaoshan Liu, Pingping Pan, Jing Chen, Zhengqi Liu, Guiqiang Liu
Abstract
Carefully designed metasurfaces can serve as effective platforms for strong coupling phenomena by the excitation of specific modes and the enhancement of light-matter interactions. However, strong coupling simultaneously involving Fabry-P\'erot (FP) cavity modes, anapole states, and excitons has not been thoroughly explored. In this work, we numerically present the strong coupling of a FP cavity-anapole-exciton supported by a nano-optical metasurface of bulk $\mathrm{W}{\mathrm{S}}_{2}$-Si heterogeneous nanodisks inserted into a FP optical cavity. The excited multiorder FP cavity modes enable giant Rabi splittings with tunable population due to all generated odd-order FP cavity modes strongly coupling with the anapole state and exciton of bulk $\mathrm{W}{\mathrm{S}}_{2}$-Si heterogeneous nanodisks. Giant Rabi splittings of 643 and 335 meV are, respectively, achieved by the first-order FP and third-order FP cavity-anapole-exciton interactions. Our designed hybrid system provides a robust platform for exploring ultrahigh Rabi splittings and strong coupling of multiple optical responses in light-matter interactions.