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<p>The solar absorber is an essential component of the solar gathering system, and a new type of broadband solar energy absorber with high performance in the full solar spectrum based on bilayer circular disk array (CDA) is proposed. To enhance the absorptivity in the visible and near-infrared spectral region, the first layer of nanoscale CDA composed of small Ti circular disks is designed. Meanwhile, by introducing cross cavity in the Ti circular disk, more resonant modes in the short wavelength are excited, and the absorptivity can be enhanced. To improve the absorptive efficiency in the long-wavelength range, a large circular disk hole is etched in the substrate and filled with <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11468_2025_3006_Article_IEq1.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathrm{Al_{2}O_{3}}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="normal">Al</mi> <mn>2</mn> </msub> <msub> <mi mathvariant="normal">O</mi> <mn>3</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>, which forms the second layer of CDA. The localized surface plasmon resonances (LSPR) and the coupling modes from the two layers of CDA could achieve high absorptivity in the full solar spectrum from 280 to 4000 nm. With optimizing the proposed absorber, the average absorptivity over the whole solar spectrum is 98.60%, the weighted absorption efficiency is 98.57%, and the thermal emissivity is calculated as 98.74% at 1900 K temperature, which has shown potential in blackbody radiation sources, thermal emitters, and so on. In addition, the absorber is insensitive to large incidence and polarization angles.</p>

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A High Efficiency Metamaterial Solar Absorber in Full Energy Spectrum Based on Bilayer Circular Disk Array

  • 期刊论文

  • 发表日期：

    2025年5月20日

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  • Ling Guo,
  • Yao Xin,
  • MinFang Shi,
  • Jun Ma,
  • Xingna Hou,
  • Shouhong Chen

摘要

The solar absorber is an essential component of the solar gathering system, and a new type of broadband solar energy absorber with high performance in the full solar spectrum based on bilayer circular disk array (CDA) is proposed. To enhance the absorptivity in the visible and near-infrared spectral region, the first layer of nanoscale CDA composed of small Ti circular disks is designed. Meanwhile, by introducing cross cavity in the Ti circular disk, more resonant modes in the short wavelength are excited, and the absorptivity can be enhanced. To improve the absorptive efficiency in the long-wavelength range, a large circular disk hole is etched in the substrate and filled with \(\mathrm{Al_{2}O_{3}}\) Al 2 O 3 , which forms the second layer of CDA. The localized surface plasmon resonances (LSPR) and the coupling modes from the two layers of CDA could achieve high absorptivity in the full solar spectrum from 280 to 4000 nm. With optimizing the proposed absorber, the average absorptivity over the whole solar spectrum is 98.60%, the weighted absorption efficiency is 98.57%, and the thermal emissivity is calculated as 98.74% at 1900 K temperature, which has shown potential in blackbody radiation sources, thermal emitters, and so on. In addition, the absorber is insensitive to large incidence and polarization angles.