Author(s): Li, T (Li, Tong); Chen, BQ (Chen, Bin-Quan); He, Q (He, Qian); Bian, LA (Bian, Li-An); Shang, XJ (Shang, Xiong-Jun); Song, GF (Song, Guo-Feng)

Source: MATERIALS Volume: 13 Issue: 22 Article Number: 5298 DOI: 10.3390/ma13225298 Published: NOV 2020

Abstract: We propose an alignment-free and polarization-selective bidirectional absorber composed of a one-dimensional bilayer Au grating array buried in a silicon nitride spacer. The absorptivity of the designed structure is more than 95% (77%) under normal forward (backward) TM-polarized light incidence, and is more than 80% (70%) within a forward (backward) incident angle up to 30 degrees. The great bidirectional absorption performance is illustrated by the resonance coupling of the surface plasmon polaritons (SPPs) resonance, the propagating surface plasmon (PSP) resonance and the localized surface plasmon (LSP) resonance under TM-polarized wave illumination. Moreover, the excitation of the Fano-like resonance mode of the proposed metasurface can produce two significantly different peaks in the absorption spectrum under the oblique TM-polarized incidence, which is beneficial for the plasmon-sensing application. Therefore, the proposed bidirectional metasurface absorber can be a candidate in the application of optical camouflage, thermal radiation, solar cells and optical sensing.

Accession Number: WOS:000594957800001

PubMed ID: 33238483

eISSN: 1996-1944

Full Text: https://www.mdpi.com/1996-1944/13/22/5298