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Numerical Study of Ultra-Broadband Metamaterial Perfect Absorber Based on Four-Corner Star Array.

Yu Cheng1, Min Xiong1, Ming Chen1

  • 1Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin 541004, China.

Nanomaterials (Basel, Switzerland)
|September 28, 2021
PubMed
Summary

A novel four-corner star array solar absorber achieves over 98% average absorption efficiency across a broad spectrum (400-2000 nm). This efficient solar absorber demonstrates excellent angle and polarization insensitivity for energy applications.

Keywords:
metamaterialperfect absorberplasmaultra-wideband

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Renewable Energy Engineering

Background:

  • The global energy crisis necessitates advancements in efficient solar energy harvesting.
  • Solar absorbers are crucial components for converting sunlight into usable energy.
  • Developing broadband, high-efficiency solar absorbers remains a key research objective.

Purpose of the Study:

  • To design and numerically analyze a novel solar absorber with a four-corner star array structure.
  • To evaluate the absorption performance, spectral range, and efficiency of the proposed absorber.
  • To investigate the tunability and angular/polarization insensitivity of the solar absorber design.

Main Methods:

  • Numerical analysis of a four-corner star array structure for solar absorption.
  • Characterization of absorption performance across the 400-2000 nm wavelength range.
  • Investigation of geometric structure effects on absorption efficiency.
  • Assessment of incident angle and polarization angle insensitivity.

Main Results:

  • The solar absorber achieved over 90% absorption across the 400-2000 nm band.
  • Sustained absorption efficiency exceeding 95% over a 1391 nm bandwidth.
  • Average absorption efficiency of more than 98% for the entire studied band.
  • Minimal solar spectrum loss (2.7%) and excellent insensitivity to incident and polarization angles.

Conclusions:

  • The proposed four-corner star array solar absorber exhibits exceptional broadband absorption and high efficiency.
  • Tunable absorption characteristics and excellent angular/polarization insensitivity make it highly promising.
  • This design holds significant potential for solar energy collection, utilization, and photothermal conversion.