A Study on Optimal Design of Magneto-Metasurface for THz Isolator

Abstract

In this paper, we design one-dimensional (1D) magneto-metasurface for THz isolator application. In this optimization, frequency domain finite element method (FD-FEM) with periodic boundary condition (PBC) is employed as a numerical simulation method and two kinds of evolutionary algorithms were used to optimize design parameters. In order to optimize two objectives to maximize unidirectional transmission and isolation ratio, we propose a novel objective function using ELU function. The results show that designed metasurface isolator with relatively simple structure can realize unidirectional transmission. In addition, it is demonstrated that angular characteristics is improved by optimizing DC magnetic field and operating temperature.