Ultrathin nano-ring metasurface absorber in visible regime based on circuit model
Faculty of Electrical and Electronics Engineering, Shiraz University of Technology, Modarres Blvd, 71557-1387, Shiraz, Iran
2 Faculty of Electrical and Electronics Engineering, University of Sistan and Baluchistan, Daneshgah Blvd, 98613-35856, Zahedan, Iran
Accepted: 7 September 2022
Published online: 20 September 2022
This paper suggests a broadband nano-ring chromium metasurface absorbers model in the shape of a square hole and circle hole which covers an extensive wavelength spectrum by introducing an equivalent circuit. So as to confirm the proposed equivalent circuit method, metamaterial absorbers were simulated and detailed. The final results of the circuit model highly match the outcomes of full-wave numerical simulations done primarily based on the finite element method (FEM). Moreover, the circuit model reduces computation time and it needs less storage versus full-wave simulations. As a result, it is easier to investigate the effects of different parameters on the performance of the suggested devices and to determine the appropriate structures. Nano-ring chromium with a square-hole absorber registers a peak absorbance (i.e., more than 99.99%) at 448 nm and minimum absorption rate (i.e., 90.35%) at 580 nm. The Nano-ring chromium with circle hole absorber recorded a peak absorbance of more than 99% and higher than 98% absorbance from 430 to 552 nm and from 626 to 728 nm, respectively. The suggested approach is easy yet general. This method can be adopted to design and simulate other subwavelength structures in a wide frequency range, such as terahertz and visible light.
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