The objective of this study is to design a broadband and wide-angle emitter based\non metamaterials with a cut-off wavelength of 2.1 â?¦m to improve the spectral efficiency of\nthermophotovoltaic emitters. To obtain broadband emission, we conducted the geometric parameter\noptimization of the number of stacked layers, the inner and outer radii of the nano-rings,\nand the thickness of the nano-rings. The numerical simulation results showed that the proposed\nemitter had an average emissivity of 0.97 within the targeted wavelength, which ranged from 0.2 â?¦m to\n2.1..m. In addition, the presented multilayer nano-ring emitter obtained 79.6% spectral efficiency with\nan InGaAs band gap of 0.6 eV at 1400 K.
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