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<p>We present the design and analysis of a mid-infrared metamaterial absorber based on a metal–dielectric–metal (MDM) configuration. The unit cell consists of an outer frame featuring a top triangular section with a cut on the bottom left corner, an L-shaped boundary along the sides and bottom, and a central rectangle with an H-shaped cavity. Gold (Au) is used as a metallic material, while silicon carbide (SiC) serves as the dielectric layer. The absorption spectrum was computed using the finite element method-based COMSOL Multiphysics simulation software. The proposed design achieves over 98% absorption of incident light with a bandwidth of 0.7&#xa0;<i>µ</i>m in transverse electric mode. Additionally, the absorber demonstrates outstanding angular-dependent absorption characteristics, maintaining over 90% absorption in the 3.7- to 4.2-<i>µ</i>m wavelength range for incident angles (<i>φ</i>) from <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11664_2025_12235_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\({0}^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>0</mn> </mrow> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation> to <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11664_2025_12235_Article_IEq2.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({46}^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>46</mn> </mrow> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation> and elevation angles (<i>θ</i>) from <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11664_2025_12235_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({24}^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>24</mn> </mrow> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation> to <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11664_2025_12235_Article_IEq4.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="25" /> </InlineMediaObject> <EquationSource Format="TEX">\({69}^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mn>69</mn> </mrow> <mo>∘</mo> </msup> </math></EquationSource> </InlineEquation>. These properties make the proposed absorber highly suitable for applications such as polarimetric sensing and infrared detection systems.</p>

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Broadband Multi-patterned Metamaterial Absorber for Mid-Infrared Region

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Bhavay Luthra,
  • Ankit,
  • Monu Nath Baitha,
  • Kamal Kishor

摘要

We present the design and analysis of a mid-infrared metamaterial absorber based on a metal–dielectric–metal (MDM) configuration. The unit cell consists of an outer frame featuring a top triangular section with a cut on the bottom left corner, an L-shaped boundary along the sides and bottom, and a central rectangle with an H-shaped cavity. Gold (Au) is used as a metallic material, while silicon carbide (SiC) serves as the dielectric layer. The absorption spectrum was computed using the finite element method-based COMSOL Multiphysics simulation software. The proposed design achieves over 98% absorption of incident light with a bandwidth of 0.7 µm in transverse electric mode. Additionally, the absorber demonstrates outstanding angular-dependent absorption characteristics, maintaining over 90% absorption in the 3.7- to 4.2-µm wavelength range for incident angles (φ) from \({0}^{\circ }\) 0 ∘ to \({46}^{\circ }\) 46 ∘ and elevation angles (θ) from \({24}^{\circ }\) 24 ∘ to \({69}^{\circ }\) 69 ∘ . These properties make the proposed absorber highly suitable for applications such as polarimetric sensing and infrared detection systems.