Abstract
We theoretically proposed and numerically analyzed a polarization-independent, wide-angle, and ultra-broadband absorber based on a multi-layer metasurface. The numerical simulation results showed that the average absorption rates were more than 97.2% covering the broad wavelength of 400~6000 nm (from visible light to mid-infrared light) and an absorption peak was 99.99%, whatever the polarization angle was changed from 0° to 90°. Also, as the incidence angle was swept from 0° to 55°, the absorption performance had no apparent change over the wavelength ranges of 400 to 6000 nm. We proved that the proposed metasurface structure was obviously advantageous to achieve impedance matching between the absorber and the free space as compared with conventionally continuous planar-film structures. The broadband and high absorption resulted from the strong localized surface plasmon resonance and superposition of resonant frequencies. As expectable the proposed absorber structure will hold great potential in plasmonic light harvesting, photodetector applications, thermal emitters and infrared cloaking.
Highlights
The numerical simulation results showed that the average absorption rates were more than 97.2% covering the broad wavelength of 400~6000 nm and an absorption peak was 99.99%, whatever the polarization angle was changed from 0◦ to 90◦
Metamaterial is a new type of composite material with sub-wavelength structure, usually composed of metal models and dielectric layers
Since the first perfect metamaterial absorber was reported by Landy et al, the direction of metamaterial absorbers had been studied by many scholars
Summary
Metamaterial is a new type of composite material with sub-wavelength structure, usually composed of metal models and dielectric layers. Wide-Angle Polarization-Independent Ultra-Broadband Absorber from Visible to Infrared Abstract: We theoretically proposed and numerically analyzed a polarization-independent, wide-angle, and ultra-broadband absorber based on a multi-layer metasurface.
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