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Miniaturized Five-Band Perfect Metamaterial THz Absorber with Small Frequency Ratio

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Abstract

A five-band polarization-insensitive perfect metamaterial absorber (PMA) is reported in this paper for THz detection and sensing applications. The proposed absorber is constructed using interconnected circular ring elements enclosed by a square loop. The ring elements are interconnected using short strip lines which increases the electrical length to offer resonance at the lower frequencies of the THz regime without increasing the electrical length. The proposed absorber has a footprint of 0.12 λeff × 0.12 λeff where λeff is the effective wavelength calculated at the lowest operating frequency. The absorber provides 92%, 84%, 90%, 100%, and 100% absorption at 0.24, 0.56, 0.65, 0.82, and 0.95 THz, respectively. The proposed structure offers structural symmetry, and hence, it is polarization-insensitive. The proposed five-band absorber has good angular stability consistent with many research works reported in the literature and has a small frequency ratio of 1:2.3:2.7:3.4:3.9. The proposed absorber can be used as a permittivity sensor and its sensitivity is estimated to vary from 5.8 GHz/permittivity unit (PU) to 23.56 GHz/PU.

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Authors and Affiliations

  1. Department of Computer Science Engineering, AVS Engineering College, Salem, 636003, India

    Vijayalakshmi Kannaiyan

  2. Kongu Engineering College, Erode, 638060, India

    Kanimozhiselvi Chenniangirivalasu Sadhasivam

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  1. Vijayalakshmi Kannaiyan
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  2. Kanimozhiselvi Chenniangirivalasu Sadhasivam
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Vijayalakshmi K–research scholar involved in the design and paper writing. Kanimozhi Selvi C S–main supervisor involved in research problem generation and paper drafting.

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Correspondence to Vijayalakshmi Kannaiyan.

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Kannaiyan, V., Sadhasivam, K.C. Miniaturized Five-Band Perfect Metamaterial THz Absorber with Small Frequency Ratio. Plasmonics 17, 79–86 (2022). https://doi.org/10.1007/s11468-021-01500-y

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