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<p>This article investigates a design of an optical algae sensor based on a defective one-dimensional ternary photonic crystal (1DTPC) structure in symmetric and asymmetric configurations. The presence of different algae species in the defect cavity varies the refractive index of the defect layer that enables a shift in resonant defect mode wavelength. For sake of better performance of the device, we operate it with optimized values of structural parameters, such as incident angle, defect layer thickness, and the number of periods. Such a designed ternary PC-based, preferably in symmetric configuration, algae biosensor exhibits a sensitivity of 492.249&#xa0;nm/RIU along with a good Quality factor 2038.238, while the asymmetric model showed sharp resonant behavior and higher optical confinement under specific conditions. The proposed sensor offers better sensing ability in symmetric mode rather asymmetric with comparatively low tramnsmission. Such idea of the proposed ternary PC based algae biosensor can be useful to detect the types of aquatic algae with minor change in their refractive indices, and is easier to fabricate for measuring watery pollutions and environmental monitoring preventing from water pollution.</p>

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A design of optical sensor with a ternary photonic crystal for detection of watery algae

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Aditi Lamba,
  • Shreya Sharma,
  • Bhuvneshwer Suthar,
  • Narendra Kumar

摘要

This article investigates a design of an optical algae sensor based on a defective one-dimensional ternary photonic crystal (1DTPC) structure in symmetric and asymmetric configurations. The presence of different algae species in the defect cavity varies the refractive index of the defect layer that enables a shift in resonant defect mode wavelength. For sake of better performance of the device, we operate it with optimized values of structural parameters, such as incident angle, defect layer thickness, and the number of periods. Such a designed ternary PC-based, preferably in symmetric configuration, algae biosensor exhibits a sensitivity of 492.249 nm/RIU along with a good Quality factor 2038.238, while the asymmetric model showed sharp resonant behavior and higher optical confinement under specific conditions. The proposed sensor offers better sensing ability in symmetric mode rather asymmetric with comparatively low tramnsmission. Such idea of the proposed ternary PC based algae biosensor can be useful to detect the types of aquatic algae with minor change in their refractive indices, and is easier to fabricate for measuring watery pollutions and environmental monitoring preventing from water pollution.