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<p>This research presents a novel metal-dielectric (Al-Al<sub>2</sub>O<sub>3</sub>) multilayer structure operating in the nanometer range, exhibiting exceptional absorption properties in the visible range at a glancing angle. The structure consists of two layers of Al-Al<sub>2</sub>O<sub>3</sub> with an additional dielectric Al<sub>2</sub>O<sub>3</sub> layer atop an air-like aerogel substrate. The proposed assembly enables tunability of absorption characteristics by varying the thickness of the top dielectric layer. Effective electromagnetic property analysis reveals a remarkable negative refractive index, categorizing the structure as a negative index metamaterial. Its simple planar configuration makes it facile for fabrication, promising potential applications in various sensing and device development domains.</p>

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Polarization-Selective and Tunable Metal-Dielectric (Al-Al2O3) Multilayer Negative Index Metamaterial Absorber

  • 期刊论文

  • 发表日期：

    2025年7月12日

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  • Monu Nath Baitha,
  • S. Shankar,
  • Santosh Kumar,
  • Kamal Kishor,
  • Kyoungsik Kim

摘要

This research presents a novel metal-dielectric (Al-Al2O3) multilayer structure operating in the nanometer range, exhibiting exceptional absorption properties in the visible range at a glancing angle. The structure consists of two layers of Al-Al2O3 with an additional dielectric Al2O3 layer atop an air-like aerogel substrate. The proposed assembly enables tunability of absorption characteristics by varying the thickness of the top dielectric layer. Effective electromagnetic property analysis reveals a remarkable negative refractive index, categorizing the structure as a negative index metamaterial. Its simple planar configuration makes it facile for fabrication, promising potential applications in various sensing and device development domains.