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Dielectric metasurfaces with high-Q toroidal resonances

Jeong, Peter A.; Goldflam, Michael G.; Campione, Salvatore; Briscoe, Jayson B.; Vabishchevich, Polina V.; Nogan, John N.; Sinclair, Michael B.; Luk, Ting S.; Brener, Igal B.

Toroidal dielectric metasurface with a Q-factor of 728 in 1500 nm wavelength are reported. The resonance couples strongly to the environment, as demonstrated with a refractometric sensing experiment.