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<p>A broadband multi resonators metasurface solar absorber with high efficiency for sustainable energy harvesting is proposed in this work. The proposed design combines aluminium and tungsten-coated resonators over the enhanced graphene substrate, leveraging synergistic nanophotonic effects to attain ultra-wide band absorption (0.2 to 3.0&#xa0;µm). The synergy is originated from three phenomenon’s (1) localized surface plasmon resonance (LSPR) in aluminium-coated resonators which confines electromagnetic energy in the UV region (0.2–0.4&#xa0;µm) (2) surface plasmon polaritons (SPP) with tungsten-coated resonators propagate along the metal–dielectric interface with extended absorption and efficiency in MIR region (2.5–3.0&#xa0;µm) (3) exceptional point physics generates strong interaction between aluminium LSPR and W generated SPP mode, which suppresses the band gaps across the visible (0.4–0.7&#xa0;µm) and near-infrared region (0.7–2.5&#xa0;µm). Modeling and analysis based on the Maxwell’s equations along with the parameters of the materials, delivers and average efficiency of absorption &gt; 96.4% and with a peak of 99.98% in the visible region. The proposed absorber is capable of delivering angular stability &gt; 95% for angle of incidence up to 50<sup>0</sup> in both TE and TM polarizations. The proposed design is scalable and fabrication tolerant as it has a minimal thickness value of 1400&#xa0;nm and the usage of robust materials like tungsten and graphene ensures the durability and reliability. The proposed design is integrated with nanophotonics, facilitating the development of compact sustainable energy technology aligned with SDG 13 of clean energy and climatic action.</p>

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Ultra-broadband plasmonic metasurface solar absorber based on graphene–tungsten composites for full-spectrum solar energy harvesting and sustainable energy applications

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • M. Bhoopathi,
  • N. A. Natraj,
  • V. Reji,
  • U. Arun Kumar

摘要

A broadband multi resonators metasurface solar absorber with high efficiency for sustainable energy harvesting is proposed in this work. The proposed design combines aluminium and tungsten-coated resonators over the enhanced graphene substrate, leveraging synergistic nanophotonic effects to attain ultra-wide band absorption (0.2 to 3.0 µm). The synergy is originated from three phenomenon’s (1) localized surface plasmon resonance (LSPR) in aluminium-coated resonators which confines electromagnetic energy in the UV region (0.2–0.4 µm) (2) surface plasmon polaritons (SPP) with tungsten-coated resonators propagate along the metal–dielectric interface with extended absorption and efficiency in MIR region (2.5–3.0 µm) (3) exceptional point physics generates strong interaction between aluminium LSPR and W generated SPP mode, which suppresses the band gaps across the visible (0.4–0.7 µm) and near-infrared region (0.7–2.5 µm). Modeling and analysis based on the Maxwell’s equations along with the parameters of the materials, delivers and average efficiency of absorption > 96.4% and with a peak of 99.98% in the visible region. The proposed absorber is capable of delivering angular stability > 95% for angle of incidence up to 500 in both TE and TM polarizations. The proposed design is scalable and fabrication tolerant as it has a minimal thickness value of 1400 nm and the usage of robust materials like tungsten and graphene ensures the durability and reliability. The proposed design is integrated with nanophotonics, facilitating the development of compact sustainable energy technology aligned with SDG 13 of clean energy and climatic action.