Design and Simulation of Terahertz Nona-Band Near Perfect Metamaterial Absorber

DOI

10.2991/978-94-6463-754-0_49How to use a DOI?

Keywords

Metamaterial Absorber (MMA); Polyimide Substrate; Terahertz Metamaterial (MTM)

Abstract

A new Metamaterial Absorber (MMA) for terahertz (THz) applications is proposed and thoroughly evaluated in this work. The designed structure comprises three layers: a modified octagon-shaped resonator serving as a unit cell on the top metallic patch, a copper ground plane, and a 0.125mm thick polyimide dielectric substrate separating the two metallic layers. Unlike conventional absorbers that exhibit either broadband or multiband absorption characteristics, the proposed MMA demonstrates tri-, penta-, hexa-, hepta-, nona-, and dodeca(twelve)-band absorption behavior. Among these, the nona-band MMA design achieves the highest absorption rates at the following frequencies: 0.722THz (94%), 0.788THz (90.2%), 0.851THz (99.9%), 0.896THz (99.9%), 0.906THz (96.5%), 0.945THz (99.9%), 0.962THz (99.9%), 0.988THz (99.9%), and 1.000THz (97%). This high-performance absorption is realized by modifying a single geometric parameter of the top resonator patch, without employing stacked layers, grouped structures, or multiple resonators. The proposed MMA exhibits superior performance under wide incident and polarization angles up to 90^◦, with an effective operating frequency range from 0.7THz to 1.0THz. The underlying physical mechanism of absorption is analyzed using electric and magnetic field distributions. Furthermore, the number of absorption bands and their corresponding resonant frequencies are compared with previously reported designs. The structure offers polarization- and angle-insensitive absorption characteristics across the terahertz band and stands out as the only planar structure to exhibit tri-, penta-, hexa-, hepta-, nona-, and dodeca-band absorption with such high-level performance. The proposed THz MMA is highly suitable for applications in communication, medical diagnostics, imaging, and sensing.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - M. Saranya
AU  - R. Gayathri
PY  - 2025
DA  - 2025/06/30
TI  - Design and Simulation of Terahertz Nona-Band Near Perfect Metamaterial Absorber
BT  - Proceedings of the 2025 International Conference on Advanced Research in Electronics and Communication Systems (ICARECS-2025)
PB  - Atlantis Press
SP  - 559
EP  - 569
SN  - 2589-4943
UR  - https://doi.org/10.2991/978-94-6463-754-0_49
DO  - 10.2991/978-94-6463-754-0_49
ID  - Saranya2025
ER  -