Design of an ultra-broadband terahertz absorber based on a patterned graphene metasurface with machine learning

Abstract

The development of patterned graphene metasurface absorbers (PGMAs) brings solution avenues to achieve light weight, thin thickness, wide absorption bandwidth, and tunable terahertz (THz) absorption properties. In order to optimize...

A mid-IR tunable graphene metasurface for ultrasensitive molecular fingerprint retrieval and refractive index sensing

“…m can reach up to 20 m 2 (V À1 s À1 ) within experimental capabilities and can be further improved by applying ligand-bound nanoparticles (NPs). 37,38 Fig. 2(a) shows the strength of the resonance, and the Q factor increase with m varying from 1 m 2 (V À1 s À1 ) to 20 m 2 (V À1 s À1 ).…”

“…[28][29][30][31][32][33] Despite the inefficient interaction between incident light and a single atomic sheet of graphene, the period arrays of graphene nanostructures exhibit plasmon resonance with significantly larger Q-factor. [34][35][36][37] Also, the narrow line widths can offer the required spectral selectivity. The possessed two-dimensional and semimetallic nature of graphene allows for electrical tunability.…”

Metasurface inverse designed by deep learning for quasi-entire terahertz wave absorption

“…Metasurfaces consist of artificial materials organized in periodic structures and are renowned for their special electromagnetic (EM) attributes, tunable refractive indices, and asymmetric transmission characteristics. 17–22 These properties make metasurfaces particularly suited for EM absorption tasks. Since Landy et al 23 first introduced metasurface absorbers, a growing number of high-performance absorbers based on metasurfaces have been proposed and demonstrated.…”

Thermal controlled multi-functional metasurface for freely switching of absorption, reflection, and transmission

“…13,14 Consequently, metasurfaces have found successful applications across diverse domains such as planar lenses, holography, optical cloaking, and beam shaping. 15–20…”