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<p>This study introduces an ultra-broadband, polarization-insensitive metamaterial absorber using titanium (Ti) resonators on TiO<sub>2</sub>/Ti thin films, optimized via particle swarm optimization (PSO). The structure achieves an average absorption of 94.26% across the 250–4000&#xa0;nm range, with dual broadband regions (469–1274&#xa0;nm and 1964–3814&#xa0;nm) maintaining over 90% absorption. It exhibits strong angular stability, with absorption above 77% (TM) and 73% (TE) at a 50° incidence, and over 83% on average up to 60°, regardless of polarization. Under AM 1.5G illumination, the absorber achieves a high solar-to-thermal conversion efficiency of 98.17%, alongside a thermal emission efficiency of ~ 95% at 1200&#xa0;K. Field distribution analyses reveal that the broadband absorption results from combined effects of surface plasmon polaritons, localized surface plasmon resonances, magnetic polaritons, and cavity resonances. The design is also robust to fabrication variations, maintaining over 92% absorption despite geometric deviations. With a record-high &gt; 90% bandwidth of 2655&#xa0;nm among Ti-based absorbers, this device is a strong candidate for applications in photovoltaics, solar thermal energy systems, and high-temperature optoelectronics.</p>

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Particle swarm-optimized titanium-based metamaterial absorber for ultra-broadband solar harvesting and high-efficiency thermal emission

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Hussein H. N. Al Taee,
  • Karzan Noori Saleh,
  • Faegheh Nazari,
  • Mostafa Sajjadi,
  • Mir Hamid Rezaei

摘要

This study introduces an ultra-broadband, polarization-insensitive metamaterial absorber using titanium (Ti) resonators on TiO2/Ti thin films, optimized via particle swarm optimization (PSO). The structure achieves an average absorption of 94.26% across the 250–4000 nm range, with dual broadband regions (469–1274 nm and 1964–3814 nm) maintaining over 90% absorption. It exhibits strong angular stability, with absorption above 77% (TM) and 73% (TE) at a 50° incidence, and over 83% on average up to 60°, regardless of polarization. Under AM 1.5G illumination, the absorber achieves a high solar-to-thermal conversion efficiency of 98.17%, alongside a thermal emission efficiency of ~ 95% at 1200 K. Field distribution analyses reveal that the broadband absorption results from combined effects of surface plasmon polaritons, localized surface plasmon resonances, magnetic polaritons, and cavity resonances. The design is also robust to fabrication variations, maintaining over 92% absorption despite geometric deviations. With a record-high > 90% bandwidth of 2655 nm among Ti-based absorbers, this device is a strong candidate for applications in photovoltaics, solar thermal energy systems, and high-temperature optoelectronics.