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<p>This paper presents a novel broadband metamaterial perfect absorber (MPA), featuring a concentric ring cavity-based structure. The design utilizes a tungsten-alumina-graphite three-layer configuration, achieving over 90% absorption across 200–000&#xa0;nm wavelengths, with peak absorption exceeding 99% in key solar spectrum ranges. Optimization through parametric analyses enhances performance across UV, visible, and near-infrared regions. The absorber demonstrates polarization insensitivity due to symmetrical unit cell structure and high efficiency for incident angles up to ± 45<sup>°</sup>. The calculated total solar absorption efficiency ranges from 92 to 97% and the solar thermal efficiency is 93% and the total thermal emissivity is 93%. The use of thermally stable materials potentially enables high-temperature applications. Numerical simulations validate the design’s effectiveness, contributing to the development of more efficient solar energy harvesting devices.</p>

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Tungsten-alumina-graphite based metamaterial absorber with concentric ring cavities for efficient solar energy harvesting

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Chandra Shekhar Prasad,
  • Mayur Gupta

摘要

This paper presents a novel broadband metamaterial perfect absorber (MPA), featuring a concentric ring cavity-based structure. The design utilizes a tungsten-alumina-graphite three-layer configuration, achieving over 90% absorption across 200–000 nm wavelengths, with peak absorption exceeding 99% in key solar spectrum ranges. Optimization through parametric analyses enhances performance across UV, visible, and near-infrared regions. The absorber demonstrates polarization insensitivity due to symmetrical unit cell structure and high efficiency for incident angles up to ± 45°. The calculated total solar absorption efficiency ranges from 92 to 97% and the solar thermal efficiency is 93% and the total thermal emissivity is 93%. The use of thermally stable materials potentially enables high-temperature applications. Numerical simulations validate the design’s effectiveness, contributing to the development of more efficient solar energy harvesting devices.