Iman Chaharmahali, Mohamadreza Soltani, Mohammadreza Hoseini, Mohammad Biabanifard
https://www.spiedigitallibrary.org/journals/Optical-Engineering/volume-59/issue-4/047101/Control-of-terahertz-waves-for-TE-and-TM-modes-using/10.1117/1.OE.59.4.047101.short?SSO=1
In the modern era of science and technology, devices with
more speed and efficiency are in high demand. Among the reliable options, the
terahertz (THz) spectra are promising. A tunable ultrabroadband THz
metamaterial absorber and a THz filter using disk graphene patterns are
proposed. Simulations exploiting an analytical circuit model based on a
developed transmission line method and the finite element method are performed.
The analytical circuit model of two graphene patterns with the transmission
line theory is utilized to obtain the input impedance of the structures to
describe the graphene metamaterial structures as circuit elements. Then,
exploiting a genetic algorithm, the input impedance of the structures is
designed to be matched to the free space in the desired terahertz spectra using
circuit principles. A parametric study of the proposed structures has been
carried out to show the capability of tuning the proposed structures. The
results clearly reveal the effectiveness of the suggested structures for
distinct practical applications, such as filters and sensors at THz spectra.
Finally, the proposed configurations can be manufactured using currently
developed techniques in addition to chemical vapor deposition.
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