Scholarlink

<p>This study presents the design and comprehensive numerical analysis of a tunable graphene-based metasurface designed for high-sensitivity plasmonic and refractive index sensing applications. The proposed structure combines a graphene nanoribbon and a U-shaped graphene resonator on a dielectric substrate, forming a hybrid metasurface that supports multiple strongly coupled plasmonic modes. Finite-difference time-domain (FDTD) method are employed to investigate the optical response under variations in geometrical parameters and environmental refractive index. The results reveal that modulation of the nanoribbon and U-shaped dimensions enables precise control over the resonance frequencies and transmission characteristics through plasmonic mode hybridization. The hybrid structure exhibits multiple, distinct resonance dips with enhanced near-field confinement and broad spectral tunability. Sensitivity analysis based on a linear dependence of resonance frequency on the surrounding refractive index yields average sensitivities of 284, 540, and 748&#xa0;GHz/RIU for Modes I–III, respectively, confirming the strong and predictable sensing performance of the device. The electric field distributions further verify intense plasmon localization and near-field coupling between the graphene elements. These findings demonstrate that the proposed graphene-based hybrid metasurface offers a compact, dynamically tunable, and highly sensitive platform suitable for next-generation terahertz and mid-infrared photonic and biosensing applications.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Design and analysis of a tunable graphene-based hybrid metasurface for high-sensitivity plasmonic and refractive index sensing

  • 期刊论文

  • 发表日期：

    2026年1月27日

查看全文
  • Hamid Heidarzadeh

摘要

This study presents the design and comprehensive numerical analysis of a tunable graphene-based metasurface designed for high-sensitivity plasmonic and refractive index sensing applications. The proposed structure combines a graphene nanoribbon and a U-shaped graphene resonator on a dielectric substrate, forming a hybrid metasurface that supports multiple strongly coupled plasmonic modes. Finite-difference time-domain (FDTD) method are employed to investigate the optical response under variations in geometrical parameters and environmental refractive index. The results reveal that modulation of the nanoribbon and U-shaped dimensions enables precise control over the resonance frequencies and transmission characteristics through plasmonic mode hybridization. The hybrid structure exhibits multiple, distinct resonance dips with enhanced near-field confinement and broad spectral tunability. Sensitivity analysis based on a linear dependence of resonance frequency on the surrounding refractive index yields average sensitivities of 284, 540, and 748 GHz/RIU for Modes I–III, respectively, confirming the strong and predictable sensing performance of the device. The electric field distributions further verify intense plasmon localization and near-field coupling between the graphene elements. These findings demonstrate that the proposed graphene-based hybrid metasurface offers a compact, dynamically tunable, and highly sensitive platform suitable for next-generation terahertz and mid-infrared photonic and biosensing applications.