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Terahertz metamaterial absorbers with fixed, controllable, and tunable multiband characteristics

BALU ASHVANTH1,* , BACTAVATCHALAME PARTIBANE2

Affiliation

  1. Dept. of ECE, Vel Tech Rangarajan Dr. Sagunthala R&D Institute of Science and Technology, Chennai-62, India
  2. Dept. of ECE, Sri Sivasubramaniya Nadar College of Engineering, Chennai-110, India

Abstract

This article presents three terahertz absorbers with Fixed, Controllable, and Tunable multiband using miniaturized metamaterial unit cells. The first absorber uses a spiral layer made of copper at the top which realizes five absorption bands from 0.1THz to 1THz. The unit cell size is minimized to š¯¯€/15.5 by using an interconnected quadrant structure. Due to the fourfold symmetry, the absorber is polarization insensitive. The second absorber consists of five arcs-based resonator. The simulation results show that the structure has five distinct absorption peaks between 0.1THz to 2THz, each with an absorption of over 90% Moreover; this design gives considerable freedom for shifting the frequencies of the absorber by varying the arc lengths. The effect of the spacing of arcs on the positioning of the individual band is analyzed. The third THz absorber functionality is improved by including a tuning mechanism. It uses a convoluted meandered line design at the top to achieve five band resonances between 0.1THz and 5THz. To enhance the bandwidth coverage, the lower four bands are made tunable by using graphene material at the spacings of the patch. The absorption peaks were raised above 95% on all the operating bands which makes it a perfect candidate to be used for sensing applications..

Keywords

Absorber, Tuning, Multiband characteristics, Metamaterial.

Submitted at: Aug. 11, 2022
Accepted at: April 5, 2023

Citation

BALU ASHVANTH, BACTAVATCHALAME PARTIBANE, Terahertz metamaterial absorbers with fixed, controllable, and tunable multiband characteristics, Journal of Optoelectronics and Advanced Materials Vol. 25, Iss. 3-4, pp. 112-120 (2023)