Possibility of Anapole State in Dielectric Nanohole Array Metasurfaces with Different Hole Shapes

The optical anapole resonances in nanostructures display strong field confinement and substantially suppressed scattering. In this study using three-dimensional finite-difference time-domain simulations, it is shown that high refractive index dielectric nanohole array metasurfaces having different profiles of the holes can possess state. multipole decomposition including dipole electric toroidal moment for lattice elements arrays provided. state illustrated by time-averaged distributions energy. As a result, high-index freestanding with be designed.