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<p>This study investigates the organic compound sensing capability of a one-dimensional (1D) defective annular photonic crystal (DeAPhC). The proposed structure, represented as (AB)<sup>5</sup>CDC(AB)<sup>5</sup>, features a cylindrical air cavity (region D) at its center, whose inner walls are coated with a thin cylindrical layer (region C). This defect is introduced within a periodic annular photonic crystal (APhC) composed of ten alternating layers of materials A and B. The air cavity thickness is optimized to 1400&#xa0;nm, which yields a maximum quality factor of 10,388.88 and a sensitivity of 1354.5&#xa0;nm/RIU when the cavity is sequentially loaded with water and pentane. The structure also demonstrates an excellent figure of merit (FoM) on the order of 10<sup>−3</sup> and a limit of detection (LoD) as low as 10<sup>−5</sup>, indicating high precision in detecting trace amounts of organic compounds in water samples. These findings highlight the potential of the proposed DeAPhC structure for highly sensitive chemical sensing. The approach can be extended to the development of advanced sensors for industrial and biomedical applications.</p>

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Theoretical study of one-dimensional annular photonic crystal based chemical sensor for detection of organic compounds

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Sujit Kumar Saini,
  • Sakshi Gandhi,
  • Anubha Gupta,
  • Suneet Kumar Awasthi

摘要

This study investigates the organic compound sensing capability of a one-dimensional (1D) defective annular photonic crystal (DeAPhC). The proposed structure, represented as (AB)5CDC(AB)5, features a cylindrical air cavity (region D) at its center, whose inner walls are coated with a thin cylindrical layer (region C). This defect is introduced within a periodic annular photonic crystal (APhC) composed of ten alternating layers of materials A and B. The air cavity thickness is optimized to 1400 nm, which yields a maximum quality factor of 10,388.88 and a sensitivity of 1354.5 nm/RIU when the cavity is sequentially loaded with water and pentane. The structure also demonstrates an excellent figure of merit (FoM) on the order of 10−3 and a limit of detection (LoD) as low as 10−5, indicating high precision in detecting trace amounts of organic compounds in water samples. These findings highlight the potential of the proposed DeAPhC structure for highly sensitive chemical sensing. The approach can be extended to the development of advanced sensors for industrial and biomedical applications.