Toroidal dipole-induced quasi-BICs in an all-dielectric metasurface for high-performance refractive index sensing.

Quasi-bound states in the continuum (quasi-BICs) in all-dielectric metasurfaces provide a promising route to realizing ultra-high Q resonances. However, the excitation and tunability of toroidal dipole (TD)-induced quasi-BICs remain challenging. In t…

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