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Infrared Metasurface with a Top Cross-Square Nanobrick Array for Realizing a Highly Efficient Lightwave Absorption

Han Chen1,2, Wuyang Ji1,2, Chuang Zhang1,2

  • 1National Key Laboratory of Science & Technology on Multispectral Information Processing, Huazhong University of Science & Technology, Wuhan 430074, China.

Materials (Basel, Switzerland)
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Summary

This study introduces a novel metasurface with a cross-square nanobrick array for efficient infrared absorption across atmospheric windows. The proposed device achieves high absorptivity and low transmittance, demonstrating its potential for advanced optical applications.

Keywords:
IR metasurfaceelectromagnetic shielding actionnear-field lightwave excitationstrong radiation absorptionsurface plasmons

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Area of Science:

  • Metamaterials and Nanophotonics
  • Infrared Optics
  • Materials Science

Background:

  • Metasurfaces offer tunable optical properties.
  • Efficient infrared absorption is crucial for various applications.
  • Traditional atmospheric windows present challenges for IR transmission.

Purpose of the Study:

  • To propose and demonstrate a metasurface for broadband infrared absorption.
  • To investigate the absorption characteristics across atmospheric windows.
  • To analyze the underlying physical mechanisms of absorption.

Main Methods:

  • Fabrication of a metasurface with a cross-square nanobrick (CSNB) array.
  • Integration of CSNB array over a composite dielectric on a silicon substrate.
  • Experimental measurement of absorptivity and transmittance spectra.

Main Results:

  • Achieved average IR absorptivity >86% from 1.28-14 μm.
  • Demonstrated transmittance <2% in the measured wavelength region.
  • Showcased polarized absorption and >80% absorptivity at 40° oblique incidence.

Conclusions:

  • The CSNB metasurface enables highly efficient, broadband IR absorption.
  • Electromagnetic shielding in nanocavities and near-field excitation contribute to absorption.
  • The metasurface shows potential for applications requiring IR radiation management.