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<p>This work presents the theoretical investigation of a one-dimensional defective photonic crystal structure proposed for edible oil impurity detection.The structure consists of alternating MgF<sub>2</sub> and TiO<sub>2</sub> layers with different oil mixtures introduced as the defect layer. Mustard oil is considered as the base oil, while argemone oil, rice bran oil, and palm oil are treated as impurity oils. The transmission characteristics of the proposed structure are investigated using the Transfer Matrix Method (TMM). The results show that the defect mode wavelength shifts systematically with changes in impurity concentration and refractive index. The effect of periodic layers and defect layer thickness on sensor performance is also analyzed. The proposed sensor exhibits high transmittance, narrow resonance linewidth, high quality factor, and excellent figure of merit. A sensitivity of nearly 298–299&#xa0;nm/RIU, Q-factor- 3.6 × 10<sup>5</sup>, figure of merit (FOM) 6.0 × 10<sup>4</sup> (RIU<sup>−1</sup>) and a detection limit of 1.64 × 10<sup>–6</sup> RIU are achieved, indicating the excellent sensing capability of the proposed structure for edible oil quality monitoring applications.</p>

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High-Q and low-detection-limit one-dimensional photonic crystal sensor for edible oil adulteration

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Sanjeev K. Srivastava,
  • Vipin Kumar,
  • Anjali,
  • Sanjeev Sharma

摘要

This work presents the theoretical investigation of a one-dimensional defective photonic crystal structure proposed for edible oil impurity detection.The structure consists of alternating MgF2 and TiO2 layers with different oil mixtures introduced as the defect layer. Mustard oil is considered as the base oil, while argemone oil, rice bran oil, and palm oil are treated as impurity oils. The transmission characteristics of the proposed structure are investigated using the Transfer Matrix Method (TMM). The results show that the defect mode wavelength shifts systematically with changes in impurity concentration and refractive index. The effect of periodic layers and defect layer thickness on sensor performance is also analyzed. The proposed sensor exhibits high transmittance, narrow resonance linewidth, high quality factor, and excellent figure of merit. A sensitivity of nearly 298–299 nm/RIU, Q-factor- 3.6 × 105, figure of merit (FOM) 6.0 × 104 (RIU−1) and a detection limit of 1.64 × 10–6 RIU are achieved, indicating the excellent sensing capability of the proposed structure for edible oil quality monitoring applications.