Abstract

We theoretically propose leaky states in an electro-optic (EO)-based all-dielectric metasurface. The EO substrate tunes leaky modes to the desired wave band with changes in applied voltage (${V_{\rm{app}}}$). For refractive index (RI) sensing, the highest figure-of-merit (FoM) in this work is 9166, quality factor ($Q$-factor) is ${1.7450}{{\rm{e}}^4}$, sensitivity is 407 nm/RIU (in RI range of 1.00–1.03), minimum detectable RI is ${1.0542}{{\rm{e}}^{- 4}}$, and relative sensitivity is ${9.94}{{\rm{e}}^{- 4}}\;{{\rm{V}}^{- 1}}$. The structure sustains the figure and line shape of leaky modes, high $Q$-factor, and FoM at different ${V_{\rm{app}}}$ and EO-coefficients. Our FoM and $Q$-factor are high, and the minimum detectable RI is smaller than previously reported. The giant $Q$-factor is promising for optical filters, modulation, and slow-light device applications.

© 2021 Optical Society of America

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