期刊
OPTICS AND LASER TECHNOLOGY
卷 143, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.optlastec.2021.107323
关键词
Solar Absorber; Disk Resonator; Square Ring Resonator; Thermal Emitter; High-Temperature Applications
This paper presents the design and analysis of an ultra-broadband solar absorber based on two TiN metasurface resonators. Simulation results demonstrate the absorber's high absorption, continuous bandwidth, and insensitivity to incident angle.
In this paper, the design and analysis of an ultra-broadband solar absorber based on the combination of two TiN metasurface resonators are presented. The absorber comprises a periodic array of combined TiN disk-square ring resonators located on a stack of TiO2/TiN films. The proposed absorber shows a high average absorption of 94% in the wavelength range of 250-3000 nm and provides a continuous bandwidth of 2200 nm (i.e., 250 nm to 2450 nm) for the absorption above 90%. The effects of geometrical parameters and the oblique incidences for both TE- and TM-polarized incident light on the absorption are discussed. Also, the impact of using other plasmonic metals instead of TiN is investigated. Simulation results obtained by the finite-difference time-domain (FDTD) method indicate a high absorption of about 80%, even for an oblique incidence up to 50 degrees for both polarizations. Having outstanding properties like high absorption, ultra-wide bandwidth, independence to irradiance polarization, and insensitivity to radiation angle make the presented solar absorber a promising choice for various high-temperature applications like energy harvesting and emitting.
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