Tunable localized surface plasmon graphene metasurface for multiband superabsorption and terahertz sensing

By M. S. Islam, Jakeya Sultana, Mohammad Biabanifard, Z. Vafapour, M. Nine, Alex Dinovitser, C. Cordeiro, B. Ng, Derek Abbott. 2020

278 citations recorded by the source corpus.

Abstract We propose a plasmon induced tunable metasurface for multiband superabsorption and terahertz sensing. It consists of a graphene sheet that facilitates perfect absorption where the graphene pattern at the top layer creates an enhanced evanescent wave that facilitates the metasurface to work as a sensor. The modelling and numerical analysis are carried out using Finite Element Method (FEM) based software, CST microwave studio where a genetic algorithm (GA) is used to optimize the geometric parameters, and metasurface tunability is achieved via an external gate voltage on the graphene. By exploiting graphene’s tunable properties we demonstrate a multiband superabsorption spectra having a maximum absorption of 99.7% in a frequency range of 0.1–2.0 THz that also maintain unique optical performance over a wide incidence angle. Further results show how the superabsorber can be used as a sensor, where the resonance frequency shifts with the refractive index of the surrounding environment.

Subfields: Aerospace Engineering, Biomedical Engineering, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/9185a5e3cb7757e70f8806aa6418b62900ec5503