Journal
NANOMATERIALS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/nano10010027
Keywords
metamaterial; light absorption; localized surface plasmon resonance; nanostructure
Categories
Funding
- National Natural Science Foundation of China [61505068]
- Key Science and Technology Project of Fujian Province [2019H0022]
- Foundation for Young Scientists of Jimei University [ZR2019002]
- Key Science and Technology Project of Jimei University [ZP2020042]
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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 4006000 nm (from visible light to mid-infrared light) and an absorption peak was 99.99%, whatever the polarization angle was changed from 0 degrees to 90 degrees. Also, as the incidence angle was swept from 0 degrees to 55 degrees, 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.
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