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A Simple Multi-band Metamaterial Absorber with Combined Polarization Sensitive and Polarization Insensitive Characteristics for Terahertz Applications

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Abstract

This paper presents a simple multi-band metamaterial absorber for terahertz applications. The unit cell of the proposed structure consists of a single square ring having gaps at the centers on three of its sides. The proposed absorber produces three absorption bands for all polarizations and hence the design can be considered as insensitive to polarization variation. It provides an average absorption of 96.92% for the TE polarization with a peak absorption of 99.44% at 3.87 THz and for the TM polarization, it provides an average absorption of 98.4% with a peak absorption of 99.86% at 3.87 THz. An additional absorption peak is observed for the TE polarization at 1.055 THz that gradually diminishes with the increase in polarization angle and completely vanishes for the TM polarization. Thus, the structure displays a hybrid polarization response with polarization insensitivity in three bands and polarization sensitivity in one band. Parametric analysis has been carried out validating the optimal selection of the design parameters. The simplicity of the design and its combined polarization sensitive and polarization insensitive absorption characteristics can find tremendous applications in the field of terahertz imaging and sensing.

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Authors and Affiliations

  1. Kalinga Institute of Industrial Technology, Bhubaneswar, 751024, India

    Bhargav Appasani & Pallav Prince

  2. Indian Institute of Technology (ISM), Dhanbad, 826004, India

    Rajeev Kumar Ranjan

  3. Birla Institute of Technology, Mesra, 835215, India

    Nisha Gupta

  4. U R Rao (ISRO) Satellite Centre, Bengaluru, 560017, India

    Vijay Kumar Verma

Authors
  1. Bhargav Appasani
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  2. Pallav Prince
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  3. Rajeev Kumar Ranjan
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  4. Nisha Gupta
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  5. Vijay Kumar Verma
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Correspondence to Bhargav Appasani.

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Appasani, B., Prince, P., Ranjan, R.K. et al. A Simple Multi-band Metamaterial Absorber with Combined Polarization Sensitive and Polarization Insensitive Characteristics for Terahertz Applications. Plasmonics 14, 737–742 (2019). https://doi.org/10.1007/s11468-018-0852-x

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  • DOI: https://doi.org/10.1007/s11468-018-0852-x

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