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Terahertz metamaterial absorber based on single pattern pentagon shaped resonator for high Q sensing



  1. Saveeetha Engineering College, Saveetha Nagar, Chennai, 602 105, India


A novel terahertz (THz) Metamaterial Absorber (MMA) is presented in this paper. It consists of a pentagon shaped resonator as a unit cell and a copper as ground plane which are separated by a 0.125 mm polyimide dielectric substrate. Unlike conventional absorbers that have single-functional absorption behavior of broadband or multi-band, the proposed device exhibits both, thirteen-band and nine-band. This is achieved by adjusting the single top patch geometrical parameter. The designed structure enables thirteen absorption peaks, of which the first, tenth and thirteenth peaks have 99% absorptivity while the sixth peak possesses a high quality factor (Q) value of 423. Moreover, the figure of merit (FOM) of the sixth absorption peak can reach 50, which is much higher than that of the other absorption modes. The proposed structure is working well for wide incident angles and polarization angles wave up to 900. The physical mechanism of the structure is analyzed by electric and magnetic field distributions. We compared the resonant frequency ranges and number of bands in this work with previous reported papers. The unique feature of the design is that it offers both polarization-sensitive-/insensitive and angle-insensitive-/sensitive absorption characteristics depending on the frequency of operation. In terahertz range, this is the first time a single planar structure provides thirteen and nine-band high-level absorption performances with sensing..


Thirteen-/nine-band MMA, Polarization and incident angle sensitive-/insensitive, Terahertz.

Submitted at: Nov. 1, 2021
Accepted at: June 7, 2022


A. ELAKKIYA, Terahertz metamaterial absorber based on single pattern pentagon shaped resonator for high Q sensing, Journal of Optoelectronics and Advanced Materials Vol. 24, Iss. 5-6, pp. 211-220 (2022)