1. Polarization-Selective Bidirectional Absorption Based on a Bilayer Plasmonic Metasurface
- Author
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Qian He, Li-an Bian, Bin-Quan Chen, Tong Li, Guo-Feng Song, and Xiongjun Shang
- Subjects
Materials science ,Absorption spectroscopy ,Physics::Optics ,02 engineering and technology ,Grating ,lcsh:Technology ,01 natural sciences ,polarization-selective ,Article ,absorb ,010309 optics ,0103 physical sciences ,General Materials Science ,lcsh:Microscopy ,Plasmon ,lcsh:QC120-168.85 ,lcsh:QH201-278.5 ,lcsh:T ,business.industry ,Bilayer ,Surface plasmon ,surface plasmons ,021001 nanoscience & nanotechnology ,Polarization (waves) ,Surface plasmon polariton ,metasurface ,lcsh:TA1-2040 ,Optoelectronics ,lcsh:Descriptive and experimental mechanics ,lcsh:Electrical engineering. Electronics. Nuclear engineering ,lcsh:Engineering (General). Civil engineering (General) ,0210 nano-technology ,business ,lcsh:TK1-9971 ,Localized surface plasmon - 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°, 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.
- Published
- 2020