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Polarization-Selective Bidirectional Absorption Based on a Bilayer Plasmonic Metasurface.

Tong Li1, Bin-Quan Chen1, Qian He1

  • 1Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering, Changsha University of Science and Technology, Changsha 410004, China.

Materials (Basel, Switzerland)
|November 26, 2020
PubMed
Summary

We developed a novel bidirectional absorber using a gold grating structure. This device achieves high absorption for TM-polarized light from both forward and backward directions, showing promise for various optical applications.

Keywords:
absorbmetasurfacepolarization-selectivesurface plasmons

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Area of Science:

  • Plasmonics
  • Metasurfaces
  • Optical Engineering

Background:

  • Metasurface absorbers are crucial for controlling light-matter interactions.
  • Bidirectional absorption is challenging to achieve with high efficiency.
  • Existing absorbers often lack polarization selectivity or require precise alignment.

Purpose of the Study:

  • To design and demonstrate an alignment-free, polarization-selective bidirectional absorber.
  • To investigate the underlying physical mechanisms for enhanced bidirectional absorption.
  • To explore potential applications in optical camouflage, thermal radiation, solar cells, and sensing.

Main Methods:

  • Numerical simulation of a 1D bilayer gold grating metasurface embedded in silicon nitride.
  • Analysis of absorptivity under varying incident angles and polarization states (TM-polarized light).
  • Investigation of coupled resonance phenomena: surface plasmon polaritons (SPPs), propagating surface plasmons (PSPs), and localized surface plasmons (LSPs).

Main Results:

  • Achieved absorptivity >95% (forward) and >77% (backward) at normal incidence for TM-polarized light.
  • Maintained high absorptivity (>80% forward, >70% backward) up to 30° incident angle.
  • Observed Fano-like resonance under oblique incidence, leading to dual absorption peaks beneficial for sensing.

Conclusions:

  • The proposed metasurface absorber exhibits excellent polarization-selective bidirectional absorption.
  • Coupled plasmon resonances (SPPs, PSPs, LSPs) and Fano-like modes are responsible for the high performance.
  • The design is a promising candidate for applications requiring efficient light absorption in both directions.