Polarization-insensitive refractive index sensor based on high-Q resonance in all-dielectric metasurface

Abstract

We report a polarization-insensitive all-dielectric metasurface that exhibits high-Q (~500) resonance at optical-communication wavelength. The refractive index sensing of the analyte indicates a sensitivity of 50 RIU/nm and figure-of-merit 16.12 RIU-1, irrespective of polarizationrotation.