Abstract

The realization of flexible tuning and enhanced chiral responses is vital for many applications in nanophotonics. This study proposes to manipulate the collective optical responses with heterostructures consisting of chiral dielectric metasurfaces and achiral J-aggregates. Owing to the resonance coupling between the chiral quasi-bound states in the continuum (QBICs) and the achiral exciton mode, large mode splitting and anticrossing are observed in both the transmission and circular dichroism (CD) spectra, which indicates the formation of hybrid chiral eigenmodes and the realization of the strong coupling regime. Considering that the radiative and dissipative damping of the hybrid eigenmodes depends on the coherent energy exchange, the chiral resonances can be flexibly tuned by adjusting the geometry and optical constants for the heterostructure, and the CD of the three hybrid eigenmodes approach the maximum (∼1) simultaneously when the critical coupling conditions are satisfied, which can be promising for enhanced chiral light–matter interactions.

© 2023 Optica Publishing Group

Resonant coupling of molecular excitons and optical anapoles in silicon nanosphere-J-aggregate heterostructures under vector beam illumination

Brighton Coe, Robert Sevik, Mahua Biswas, and Uttam Manna
Appl. Opt. 62(20) 5487-5493 (2023)

Phase-change metasurfaces for dynamic control of chiral quasi-bound states in the continuum

Shi Li, Tian Sang, Chaoyu Yang, Junjian Lu, and Yueke Wang
Opt. Lett. 48(24) 6488-6491 (2023)

Giant optical chirality in dielectric metasurfaces induced by toroidal dipole resonances

Jiaju Wu, Haitao Jiang, ZhiWei Guo, Yong Sun, Yunhui Li, and Hong Chen
Opt. Lett. 48(4) 916-919 (2023)

Quasi-symmetry-protected BICs in a double-notched silicon nanodisk metasurface

Wenbin Ma and Chaobiao Zhou
Opt. Lett. 48(8) 2158-2161 (2023)

Achiral nanoparticle trapping and chiral nanoparticle separating with quasi-BIC metasurface

Na Liu, Shutao Wang, Jiangtao Lv, and Jinqing Zhang
Opt. Express 31(18) 28912-28928 (2023)