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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2023-04-30
A Triband Hexagonal Shaped Polarization Insensitive Absorber by Tuning Graphene Material in Terahertz Frequency Domain
By
Nagandla Prasad,

    Dr. Nagandla Prasad

    Department of Electronics and Communication Engineering

    Koneru Lakshmaiah Education Foundation

    India

    Homepage

Pokkunuri Pardhasaradhi,

    Dr. Pokkunuri Pardhasaradhi

    Department of ECE

    Koneru Lakshmaiah Education Foundation

    India

    Homepage

Boddapati Taraka Phani Madhav,

    Professor Boddapati Taraka Phani Madhav

    Department of Electronics and Communication Engineering

    Koneru Lakshmaiah Education Foundation

    India

    Homepage

Vysyaraju Lokesh Raju,

    Dr. Vysyaraju Lokesh Raju

    Department of ECE

    Aditya Institute of Technology and Management

    India

    Homepage

Pucha Poorna Priya

    Dr. Pucha Poorna Priya

    Department of ECE

    Dadi Institute of Engineering and Technology

    India

    Homepage

Progress In Electromagnetics Research M, Vol. 116, 145-154, 2023
doi:10.2528/PIERM23031508 | Google Scholar

Abstract
Terahertz era is becoming a more prominent and expanding platform for a variety of applications. In this paper, we propose a triband absorber with a hexagon-shaped radiating patch for THz applications. The proposed structure has three layers: a hexagonal patch made of graphene as a radiating patch, a silicon layer as a dielectric substrate, and a bottom conductive layer made of gold to prevent EM wave transmission. The proposed structure operates at three resonant frequencies 0.38 THz, 1.23 THz, and 1.77 THz respectively. We may accomplish maximum absorption level (above 90%) and maximum absorption bandwidth by setting relevant chemical potential and relaxation times to 0.2 ev and 0.2 ps respectively. The proposed structure contains a lossy silicon substrate, which has a dielectric constant of 11.9 and a loss tangent of 2.5e-004. The proposed structure reveals a larger absorption [above 90%] for the operating frequencies, and the effect on absorbance for different modes is illustrated.
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Citation
Nagandla Prasad, Pokkunuri Pardhasaradhi, Boddapati Taraka Phani Madhav, Vysyaraju Lokesh Raju, and Pucha Poorna Priya, "A Triband Hexagonal Shaped Polarization Insensitive Absorber by Tuning Graphene Material in Terahertz Frequency Domain," Progress In Electromagnetics Research M, Vol. 116, 145-154, 2023.
doi:10.2528/PIERM23031508
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