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<p>This work presents a high-sensitivity, polarization-insensitive near-infrared (NIR) metamaterial perfect absorber (MPA) operating at 176.5 THz (1700&#xa0;nm) for non-invasive blood glucose sensing applications. The novelty of the proposed design lies in its wavy-edge resonant structure integrated with a three-gap split-ring resonator (SRR), enabling narrowband perfect absorption and stable performance under wide incident and polarization angles (0°–80°). The absorber is realized using a tungsten–silicon dioxide–tungsten multilayer configuration, achieving unity absorption (≈100%) with a narrow full-width at half-maximum (FWHM) of 0.7 THz. To model the biological interaction, a single-finger chamber based on the Cole–Cole dielectric model is developed, incorporating tissue-specific permittivity variations corresponding to glucose concentrations ranging from 50 to 250&#xa0;mg/dL. Variations in refractive index (1.30–1.40 RIU) induce measurable resonance shifts, enabling quantitative sensing. The proposed sensor demonstrates a high-quality factor (Q) of 252.21, sensitivity of 15.27 THz/RIU, figure of merit (FOM) of 21.81 RIU⁻1, signal-to-noise ratio (SNR) of 7.85, dynamic range (DR) of 219, spatial resolution (SR) of 0.055 THz/RIU, and a low detection limit (DL) of 0.018 RIU. The electromagnetic and circuit-level responses are validated using CST Studio Suite, ANSYS HFSS, and Advanced Design System (ADS), showing strong agreement. Owing to its high selectivity, wide angular stability, and enhanced sensing metrics, the proposed architecture offers a promising platform for compact, non-invasive biomedical glucose monitoring and advanced NIR biosensing applications.</p>

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High-sensitivity polarization-insensitive near-infrared metamaterial resonant absorber based on the Cole–Cole dielectric model for non-invasive glucose monitoring

  • 期刊论文

  • 发表日期：

    2026年7月13日

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  • Harshmani Yadav,
  • Rajesh Yadav,
  • Hina Yadav

摘要

This work presents a high-sensitivity, polarization-insensitive near-infrared (NIR) metamaterial perfect absorber (MPA) operating at 176.5 THz (1700 nm) for non-invasive blood glucose sensing applications. The novelty of the proposed design lies in its wavy-edge resonant structure integrated with a three-gap split-ring resonator (SRR), enabling narrowband perfect absorption and stable performance under wide incident and polarization angles (0°–80°). The absorber is realized using a tungsten–silicon dioxide–tungsten multilayer configuration, achieving unity absorption (≈100%) with a narrow full-width at half-maximum (FWHM) of 0.7 THz. To model the biological interaction, a single-finger chamber based on the Cole–Cole dielectric model is developed, incorporating tissue-specific permittivity variations corresponding to glucose concentrations ranging from 50 to 250 mg/dL. Variations in refractive index (1.30–1.40 RIU) induce measurable resonance shifts, enabling quantitative sensing. The proposed sensor demonstrates a high-quality factor (Q) of 252.21, sensitivity of 15.27 THz/RIU, figure of merit (FOM) of 21.81 RIU⁻1, signal-to-noise ratio (SNR) of 7.85, dynamic range (DR) of 219, spatial resolution (SR) of 0.055 THz/RIU, and a low detection limit (DL) of 0.018 RIU. The electromagnetic and circuit-level responses are validated using CST Studio Suite, ANSYS HFSS, and Advanced Design System (ADS), showing strong agreement. Owing to its high selectivity, wide angular stability, and enhanced sensing metrics, the proposed architecture offers a promising platform for compact, non-invasive biomedical glucose monitoring and advanced NIR biosensing applications.