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    A thz metamaterial absorber with multiple polarization: Insensitive, sensitive, and tunable
    (2021-01-01)
    Mohanty, Ayesha
    ;
    Acharya, Om Prakash
    ;
    Appasani, Bhargav
    ;
    Sooksood, Kriangkrai
    ;
    Mohapatra, Sushanta Kumar
    Terahertz (THz) absorbers are gaining interest in many applications. In this paper, we present the design and simulation of a multiband metama-terial absorber (MMA) with combined polarization properties and prominent absorption at 2.2 THz and 3.9 THz. The MMA comprises two square split-ring resonators and one square ring resonator placed on top of a polyimide dielectric spacer, offering multiband absorption characteristics with maximum absorptivity of 93.18% and 96.09%, respectively. The most protruding feature of this design is that it displays multiple polarization characteristics, including insensitivity, sensitivity, and tunability, even though the structure is similar to those of conventional absorbers. Firstly, the distinctly visible absorption spectra at 1.8 THz, gradually diminishes with an increase in polarization angle and then completely vanishes for TM polarization. Secondly, the prominent band at 2.2 THz is insensitive to changes in polarization of the incident wave, whereas, at 3.9 THz, the absorption band displays polarization tunability characteristics. Due to the multiple characteristics displayed by the structure, this MMA can be simultaneously used for several applications in the terahertz frequency regime such as imaging, terahertz spectroscopy, sensing, and stealth technology.
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    Polarization insensitive switchable metamaterial absorber/reflector for x-band applications
    (2020-01-01)
    Mustapha, M. G.
    ;
    Rahim, M. K.A.
    ;
    Murad, N. A.
    ;
    Ayop, O.
    ;
    Tuntrakool, S.
    A unit cell of squared shaped polarization-insensitive switchable metamaterial absorber/reflector is presented. The structure operates at 10.20 GHz under both absorber mode and reflector mode configurations. Copper wire bridging the gaps to form a circular shape structure were used as switches for operation mode selections. The structure was designed on an FR4 substrate, and the incidental wave angles were varied from 0 to 50 degrees. The structure demonstrated almost 100% absorption at resonance, 3.314 GHz percentage bandwidth at 80% as an absorber. On the other hand, as reflector, it demonstrated almost a 90% reflection and a usable bandwidth of 3.327 GHz.