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<p>A novel metamaterial absorber for sensing applications has been proposed in this paper. The proposed absorber features a simple unit cell comprising a cone-shaped gold bar placed above the graphene sheet. The proposed absorber is polarization-insensitive and achieves triple-band absorption at 13.02 THz, 13.82 THz, and 15.6 THz. The absorption characteristics are dynamically tunable by varying the chemical potential. Furthermore, analysis of the proposed absorber with glucose as the analyte confirms the absorber’s suitability as a biochemical sensor. The absorber was examined using glucose solutions as analytes to assess its efficacy as a biochemical sensor. The structure demonstrated strong sensitivities of 6, 6.5, and 6.5 THz/RIU at the three corresponding resonant peaks upon a shift in refractive index from 1.3198 to 1.3594. These results confirm the absorber’s strong potential for reliable, label-free biochemical sensing in the terahertz regime, with additional applicability for detecting glucose levels and disease markers such as malaria.</p>

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Cone-Shaped Disk Loaded Polarization-Insensitive Metamaterial for Refractive Index Sensing

  • 期刊论文

  • 发表日期：

    2026年1月31日

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  • M. Meenakshi Sundaram,
  • Madurakavi Karthikeyan

摘要

A novel metamaterial absorber for sensing applications has been proposed in this paper. The proposed absorber features a simple unit cell comprising a cone-shaped gold bar placed above the graphene sheet. The proposed absorber is polarization-insensitive and achieves triple-band absorption at 13.02 THz, 13.82 THz, and 15.6 THz. The absorption characteristics are dynamically tunable by varying the chemical potential. Furthermore, analysis of the proposed absorber with glucose as the analyte confirms the absorber’s suitability as a biochemical sensor. The absorber was examined using glucose solutions as analytes to assess its efficacy as a biochemical sensor. The structure demonstrated strong sensitivities of 6, 6.5, and 6.5 THz/RIU at the three corresponding resonant peaks upon a shift in refractive index from 1.3198 to 1.3594. These results confirm the absorber’s strong potential for reliable, label-free biochemical sensing in the terahertz regime, with additional applicability for detecting glucose levels and disease markers such as malaria.