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<p>PbSe thin film is theoretically exploited at the wavelength of <i>λ</i> = 3.4&#xa0;μm for sensing characteristics using the angular interrogation technique. The lossy modes supported by the PbSe thin film helps in generation of mode resonances in the composite structure for the refractive index sensing range 1.33–1.39. It is observed that by introducing a dielectric matching layer of refractive index 1.34, the obtained sensing character of the proposed structure can be enhanced significantly. Using this characteristic a sucrose concentration detection refractive index sensor is proposed with a sensitivity value of 84°/RIU and 107.5°/RIU for TE and TM polarizations of light respectively. Results consisting of matching layer effect, FWHM and FOM are presented after various parameter optimizations for TE and TM polarization of light. The calibration plots also support the obtained linear sensing response of the proposed sensor.</p>

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Linear response refractive index sensor using lossy modes of PbSe thin film

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Manoj Kumar,
  • Anil Kumar,
  • Shekhar Ghosal,
  • Manju Rani,
  • Rakesh Saini,
  • Geeta Bhatt,
  • Manoj K. Khanna

摘要

PbSe thin film is theoretically exploited at the wavelength of λ = 3.4 μm for sensing characteristics using the angular interrogation technique. The lossy modes supported by the PbSe thin film helps in generation of mode resonances in the composite structure for the refractive index sensing range 1.33–1.39. It is observed that by introducing a dielectric matching layer of refractive index 1.34, the obtained sensing character of the proposed structure can be enhanced significantly. Using this characteristic a sucrose concentration detection refractive index sensor is proposed with a sensitivity value of 84°/RIU and 107.5°/RIU for TE and TM polarizations of light respectively. Results consisting of matching layer effect, FWHM and FOM are presented after various parameter optimizations for TE and TM polarization of light. The calibration plots also support the obtained linear sensing response of the proposed sensor.