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<p>We propose a dual-directional plasmonic metamaterial absorber (MMA) with a simple multilayered architecture that simultaneously achieves ultra-narrowband and ultra-broadband absorption. The structure comprises a SiO<sub>2</sub>/Ag/SiO<sub>2</sub>/Ti/SiO<sub>2</sub> stack with integrated monolayer graphene sheets, featuring a dual bowtie aperture pattern for strong field confinement. Under top illumination, it exhibits nine near-perfect narrowband peaks (avg. ~98% absorptance, 400–1200&#xa0;nm), while bottom illumination induces broadband absorption (&gt; 90%). The resonant wavelengths are dynamically tunable via electrostatic gating, enabling active control. Full-wave simulations reveal Fabry-Pérot-like cavity resonances enhanced by plasmonic hotspots, yielding exceptional sensing performance (sensitivity: 1306&#xa0;nm/RIU, FOM: 261.21/RIU, Q-factor: 215.4). Fabrication-compatible with CVD graphene and FIB patterning, our design outperforms existing MMAs in efficiency, bidirectional functionality, and ease of fabrication. This platform uniquely enables switching between hyperspectral sensing and solar thermal harvesting in a single device, with applications in refractive index sensing, optical switching, and energy harvesting.</p>

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Multi-mode and bidirectional plasmonic metamaterial absorber based on bilayer graphene and bowtie-shaped windows

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Yuan-Fong Chou Chau,
  • Sy-Hann Chen,
  • Hung Ji Huang,
  • Roshan Thotagamuge,
  • Muhammad Raziq Rahimi Kooh

摘要

We propose a dual-directional plasmonic metamaterial absorber (MMA) with a simple multilayered architecture that simultaneously achieves ultra-narrowband and ultra-broadband absorption. The structure comprises a SiO2/Ag/SiO2/Ti/SiO2 stack with integrated monolayer graphene sheets, featuring a dual bowtie aperture pattern for strong field confinement. Under top illumination, it exhibits nine near-perfect narrowband peaks (avg. ~98% absorptance, 400–1200 nm), while bottom illumination induces broadband absorption (> 90%). The resonant wavelengths are dynamically tunable via electrostatic gating, enabling active control. Full-wave simulations reveal Fabry-Pérot-like cavity resonances enhanced by plasmonic hotspots, yielding exceptional sensing performance (sensitivity: 1306 nm/RIU, FOM: 261.21/RIU, Q-factor: 215.4). Fabrication-compatible with CVD graphene and FIB patterning, our design outperforms existing MMAs in efficiency, bidirectional functionality, and ease of fabrication. This platform uniquely enables switching between hyperspectral sensing and solar thermal harvesting in a single device, with applications in refractive index sensing, optical switching, and energy harvesting.