4.5 Article

Polarization-insensitive dual-band terahertz metamaterial absorber based on asymmetric arrangement of two rectangular-shaped resonators

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OPTIK
卷 245, 期 -, 页码 -

出版社

ELSEVIER GMBH
DOI: 10.1016/j.ijleo.2021.167669

关键词

Metamaterials; Dual-band THz absorber; Polarization-insensitive absorber

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资金

  1. Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.99-2020.45]
  2. Ministry of Education and Training, Vietnam [B2020-MDA-10]

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A three-layer structure metamaterial absorber was designed for polarization-insensitive dual-band absorption in the THz region, achieving absorptivity greater than 96% at specific frequencies. The asymmetrical design structure eliminates polarization dependence and allows for tuning of absorption bands by varying the resonator dimensions.
We present a design of a polarization-insensitive dual-band metamaterial absorber (MA) in the THz region by employing a three-layer structure consisting of a rectangular-shaped resonator on top of silicon and metallic film. Finite-difference time domain (FDTD) simulation indicates that two perfect absorption peaks can be achieved at 5.35 and 9.0 THz with absorptivity greater than 96% under normal incidence. The asymmetry in design structure eliminates any polarization dependence, and absorptivity is nearly 80% for large incidence angle up to 60 degrees. The individual absorption band can be tuned by varying the dimensions of the rectangular-shaped resonator. The design idea provides a new strategy to achieve polarization-insensitive MA by arranging structure and can be extended to other bands.

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