Strong coupling between excitons and magnetic dipole quasi-bound states in the continuum in WS${}_2$-TiO${}_2$ hybrid metasurfaces

Abstract

Enhancing the light-matter interactions in two-dimensional materials via optical metasurfaces has attracted much attention due to its potential to enable breakthrough in advanced compact photonic and quantum information devices. Here, we theoretically investigate a strong coupling between excitons in monolayer WS${}_2$ and quasi-bound states in the continuum (quasi-BIC). In the hybrid structure composed of WS${}_2$ coupled with asymmetric titanium dioxide nanobars, a remarkable spectral splitting and typical anticrossing behavior of the Rabi splitting can be observed, and such strong coupling effect can be modulated by shaping the thickness and asymmetry parameter of the proposed metasurfaces. It is found that the balance of line width of the quasi-BIC mode and local electric field enhancement should be considered since both of them affect the strong coupling, which is crucial to the design and optimization of metasurface devices. This work provides a promising way for controlling the light-matter interactions in strong coupling regime and opens the door for the future novel quantum, low-energy, distinctive nanodevices by advanced meta-optical engineering.

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• Tunable strong plasmon-exciton coupling based on borophene and deep subwavelength perovskite grating
• Extremely intrinsic chirality in two-dimensional planar waveguide grating induced by quasi-bound states in the continuum
• Enhanced third-harmonic generation and degenerate four-wave mixing in an all-dielectric metasurfaces via Brillouin zone folding-induced bound states in the continuum
• Enhancing Faraday and Kerr rotations based on toroidal dipole mode in an all-dielectric magneto-optical metasurface
• Bound States in the Continuum in Multipolar Lattices
• Polaritonic Critical Coupling in a Hybrid Quasi-Bound States in the Continuum Cavity-WS${}_2$ Monolayer System
• A universal and stable metasurface for photonic quasi bound state in continuum coupled with two dimensional semiconductors