Bicontrollable Terahertz Metasurface with Subwavelength Scattering Elements of Two Different Materials

TL;DR

This paper demonstrates a terahertz metasurface with subwavelength elements made of two different controllable materials, enabling tunable transmission properties via magnetic and thermal stimuli.

Contribution

It introduces a bicontrollable metasurface design combining magnetostatic and thermal control for dynamic terahertz wave manipulation.

Findings

Stopbands shift with magnetic field or temperature changes.

Control level varies depending on spectral location and stimulus type.

Magnetostatic control depends on field configuration.

Abstract

Transmission of a normally incident plane wave through a metasurface with bicontrollable subwavelength scattering elements was simulated using a commercial software. Some pixels comprising the $H-shaped scattering elements were made of a magnetostatically controllable material whereas the remaining pixels were made of a thermally controllable material, the metasurface designed to operate in the terahertz spectral regime. The co-polarized transmission coefficients were found to exhibit stopbands that shift when either a magnetostatic field is applied or the temperature is increased or both. Depending on spectral location of the stopband, either the magnetostatic field gives coarse control and temperature gives fine control or vice versa. The level of magnetostatic control depends on the magnetostatic-field configuration.