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This study introduces a novel metasurface perfect absorber with ultra-broadband absorption capabilities. The designed structure demonstrates high efficiency and stability for thermal energy harvesting and solar absorption applications.

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Area of Science:

  • Metamaterials and Nanophotonics
  • Optical Engineering
  • Materials Science

Background:

  • Metasurfaces offer unique electromagnetic properties.
  • Developing efficient broadband absorbers is crucial for energy applications.
  • High-temperature stability is essential for practical absorber deployment.

Purpose of the Study:

  • To propose and analyze an ultra-broadband metasurface-based perfect absorber.
  • To investigate the absorption characteristics and tunability of the proposed structure.
  • To evaluate its suitability for thermal energy harvesting and solar absorption.

Main Methods:

  • Design of a metasurface comprising truncated cone-shaped structures surrounded by TiN/SiN conical rings.
  • Utilizing refractory materials for high-temperature structural stability.
  • Numerical simulations to analyze absorption spectra, angular dependence, and parameter optimization.

Main Results:

  • Achieved ultra-broadband absorption from 0.2-4.5 µm with >90% absorption.
  • Demonstrated super absorption (>97.40%) from 0.2-3.25 µm with average absorption >99%.
  • Showcased near-insensitivity to incident angles for TE polarization and weak dependence for TM polarization.

Conclusions:

  • The proposed metasurface perfect absorber exhibits excellent broadband absorption and high efficiency.
  • Its structural stability at high temperatures and angular tolerance make it promising for solar energy harvesting.
  • The tunable absorption through cone angle offers design flexibility for specific applications.