Quasi-BIC based all-dielectric metasurfaces for ultra-sensitive refractive index and temperature sensing.

ABSTRACT: In this paper, an all-dielectric metasurface that measures refractive index and temperature using silicon disks is presented. It can simultaneously produce three resonances excited by a magnetic toroidal dipole, magnetic toroidal quadrupole, and electric toroidal dipole, in the THz region. Asymmetric structures are used to generate two quasi-bound states in the continuum (BIC) resonances with ultra-high-quality factors driven by magnetic and electric toroidal dipoles. We numerically study and show the dominant electromagnetic excitations in the three resonances through near-field analysis and cartesian multipole decomposition. The effects of geometric parameters, scaling properties, polarization angles, incident angles, and silicon losses are also investigated. The proposed metasurface is

SUBMITTER: Saadatmand SB 

PROVIDER: S-EPMC10667344 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature