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<p>In this work, a photonic crystal-based temperature sensor is proposed and numerically investigated. The device incorporates a waveguide coupled to two capsule-alike cavities. The results show a linear variation of the refractive index change (<i>∆n</i>) with temperature, ensuring high stability. The proposed sensor exhibits a maximum sensitivity of 104 pm/°C at low temperatures and stabilizes around 89 pm/°C at higher temperatures. In addition, a refractive index sensitivity of 433&#xa0;nm/RIU and a quality factor approximately 8475 is obtained under ideal conditions, indicating good resonance characteristics. The improved performance is achieved through a local geometrical modification of the air holes surrounding the cavity. These results demonstrate a well-balanced trade-off between sensitivity and quality factor, making the proposed design suitable for reliable temperature sensing applications.</p>

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Design and optimization of a 2D photonic crystal temperature sensor with improved sensitivity and quality factor

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Abdelaziz Benseih,
  • Fatima Zohra Satour,
  • Ameur Zegadi

摘要

In this work, a photonic crystal-based temperature sensor is proposed and numerically investigated. The device incorporates a waveguide coupled to two capsule-alike cavities. The results show a linear variation of the refractive index change (∆n) with temperature, ensuring high stability. The proposed sensor exhibits a maximum sensitivity of 104 pm/°C at low temperatures and stabilizes around 89 pm/°C at higher temperatures. In addition, a refractive index sensitivity of 433 nm/RIU and a quality factor approximately 8475 is obtained under ideal conditions, indicating good resonance characteristics. The improved performance is achieved through a local geometrical modification of the air holes surrounding the cavity. These results demonstrate a well-balanced trade-off between sensitivity and quality factor, making the proposed design suitable for reliable temperature sensing applications.