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Polyimide substrate-based polarization-dependent metamaterial absorber for terahertz applications

K. VIGNESHWARAN1,* , R. SAMSON DANIEL1

Affiliation

  1. Department of Electronics and Communication Engineering, K. Ramakrishnan College of Engineering, Samayapuram, Trichy, 621 112, India

Abstract

A straightforward planar nonagon-shaped Terahertz (THz) Metamaterial Absorber (MMA) is devised and simulated for refractive index sensing applications. The proposed absorber employs three layers, with a polyimide dielectric substrate sandwiched between two copper layers, avoiding the need for multiple layers or numerous resonators in a single unit cell. The output absorption curves of this MMA exhibit polarization dependency, resonating at three frequencies in the x-direction and two frequencies in the y-direction, resulting in a total of five resonant frequencies across both directions. In the x-direction, the absorption rates at resonance frequencies of 0.78 THz, 0.793 THz, and 0.81 THz are 96.5%, 99.7%, and 99.8%, respectively. In the y-direction, the absorption rates are 99% for resonance frequencies of 0.791 THz and 0.799 THz. The refractive index (RI) sensing mechanism is analysed by placing a 1 µm analyte over the top patch structure, revealing a high quality factor and figure of merit (FOM) values of 371 and 47.6 RIU-1, respectively. The physical mechanisms of the structure are investigated through electric field distribution, magnetic field distribution, and surface current distribution plots. Additionally, the polarization and incident angle characteristics of the structure are assessed by varying the angle values from zero degrees to ninety degrees. This absorber is intended for utilization in terahertz sensing applications..

Keywords

Polarization dependent metamaterial absorber, Refractive index sensing, Terahertz.

Submitted at: July 4, 2024
Accepted at: Feb. 3, 2005

Citation

K. VIGNESHWARAN, R. SAMSON DANIEL, Polyimide substrate-based polarization-dependent metamaterial absorber for terahertz applications, Journal of Optoelectronics and Advanced Materials Vol. 27, Iss. 1-2, pp. 1-8 (2025)