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Triple-band polarization-independent terahertz absorber based on concentric slotted multimode structure

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Published/Copyright: November 17, 2025
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Frequenz
From the journal Frequenz Volume 80 Issue 5-6

Abstract

In this article, triple band polarization insensitive multiband metamaterial absorber is proposed for terahertz (THz) applications. The proposed unit cell size is of 140 × 140 µm2, consisting of a metallic radiator at the top layer with conducting ground plane of copper and polyamide substrate material with dielectric constant ε r = 4.3 and loss tangent tan δ = 0.004. Four concentric rings acting as resonators are designed to develop a triple band absorber. The proposed design is providing absorption at 0.615 THz, 0.951 THz and at 1.007 THz frequency with absorption of 97.5 %, 98.94 % and 99 % respectively. Due to symmetry in design, it is polarization insensitive from angles 0–60°. The results confirm that the proposed absorber design offers a wide range of THz applications in sensing, imaging and filtering.

Keywords: terahertz (THz); absorber; polarization insensitive; metamaterial (MTM)
Corresponding author: Ashish Kumar, Chitkara University Institute of Engineering and Technology, Chitkara University, Rajpura, Punjab, India, E-mail:

  1. Research ethics: Not applicable.

  2. Informed consent: Not applicable.

  3. Author contributions: All authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: The author states no conflict of interest.

  6. Research funding: None declared.

  7. Data availability: Not applicable.

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Received: 2025-05-02
Accepted: 2025-09-12
Published Online: 2025-11-17
Published in Print: 2026-06-24

© 2025 Walter de Gruyter GmbH, Berlin/Boston

Articles in the same Issue

  1. Frontmatter
  2. Research Articles
  3. Triple-band polarization-independent terahertz absorber based on concentric slotted multimode structure
  4. Design and performance analysis of a modulated patch stubbed feedline bandstop filter with dual windows tapered annular DGS
  5. Performance analysis of DP-MZM based RoF network for 5G/6G
  6. Secure transmission with different security requirements based on covert communication and information-theoretic security in the presence of friendly jammer
  7. Investigations for a joint FMCW radar and wireless communication system in FDM taking into account the power amplifier characteristics
  8. Efficiency enhancement of CW magnetron by cathode priming
  9. Quad-band rectenna for power harvesting and other biomedical applications
  10. A practical approach for comparative assessment of electromagnetic attenuation in bulky materials using reflection-only measurements
  11. Short Communications
  12. Horizontally polarized low sidelobe level inclined-slot array antenna using ridged waveguide
  13. A stopband-improved and size-miniaturized low-pass filter based on substrate integrated coaxial lines and etched substrate-integrated half-coaxial lines
https://doi.org/10.1515/freq-2025-0154
Keywords for this article
terahertz (THz); absorber; polarization insensitive; metamaterial (MTM)

Articles in the same Issue

  1. Frontmatter
  2. Research Articles
  3. Triple-band polarization-independent terahertz absorber based on concentric slotted multimode structure
  4. Design and performance analysis of a modulated patch stubbed feedline bandstop filter with dual windows tapered annular DGS
  5. Performance analysis of DP-MZM based RoF network for 5G/6G
  6. Secure transmission with different security requirements based on covert communication and information-theoretic security in the presence of friendly jammer
  7. Investigations for a joint FMCW radar and wireless communication system in FDM taking into account the power amplifier characteristics
  8. Efficiency enhancement of CW magnetron by cathode priming
  9. Quad-band rectenna for power harvesting and other biomedical applications
  10. A practical approach for comparative assessment of electromagnetic attenuation in bulky materials using reflection-only measurements
  11. Short Communications
  12. Horizontally polarized low sidelobe level inclined-slot array antenna using ridged waveguide
  13. A stopband-improved and size-miniaturized low-pass filter based on substrate integrated coaxial lines and etched substrate-integrated half-coaxial lines
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