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<p>A narrowband Terahertz (THz) sensor is designed for biomedical sensing applications. The step impedance-based resonator (SIR) based square rings are used to design the top layer. Initially the analysis is carried out by considering the refractive index (n) value from 1 to 2 with step size 0.2. The peak resonant frequency (PRF) occurred at 2.1487THz with 99.9% absorptivity for <i>n</i> = 1 case. The PRF followed a shift towards lower resonance for each increment of n value supporting its suitability for refractive index unit (RIU) sensing. The absorptivity and the reflection coefficient curve response for the THz absorber is presented over the selected frequency range from 1.9 to 2.3THz. The field distribution curves like electric, magnetic and the current distribution are presented at the resonant frequency. A glycosuria layer is formed on top of the proposed THz absorber. The glucose level in urine is considered from normal to more severe concentrations for the analysis purpose. Based on the concentration of the glucose or the change in (n) value, the SIR based THz sensor performance is presented with the help of frequency shift (∆f), sensitivity (S), figure of merit (FoM) and Q-factor. The sensitivity for all considered n values when compared with air as analyte is greater than 400&#xa0;GHz/RIU. The significant shift in PRF over the change in the refractive index further proved its suitability for biosensing applications at THz regime.</p>

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A Terahertz Sensor Using Step Impedance Resonator Inspired Square Rings for Glycosuria Sensing

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Rayudu Bharath Kumar,
  • Moses Nesasudha,
  • Doondi Kumar Janapala

摘要

A narrowband Terahertz (THz) sensor is designed for biomedical sensing applications. The step impedance-based resonator (SIR) based square rings are used to design the top layer. Initially the analysis is carried out by considering the refractive index (n) value from 1 to 2 with step size 0.2. The peak resonant frequency (PRF) occurred at 2.1487THz with 99.9% absorptivity for n = 1 case. The PRF followed a shift towards lower resonance for each increment of n value supporting its suitability for refractive index unit (RIU) sensing. The absorptivity and the reflection coefficient curve response for the THz absorber is presented over the selected frequency range from 1.9 to 2.3THz. The field distribution curves like electric, magnetic and the current distribution are presented at the resonant frequency. A glycosuria layer is formed on top of the proposed THz absorber. The glucose level in urine is considered from normal to more severe concentrations for the analysis purpose. Based on the concentration of the glucose or the change in (n) value, the SIR based THz sensor performance is presented with the help of frequency shift (∆f), sensitivity (S), figure of merit (FoM) and Q-factor. The sensitivity for all considered n values when compared with air as analyte is greater than 400 GHz/RIU. The significant shift in PRF over the change in the refractive index further proved its suitability for biosensing applications at THz regime.