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<p>This paper presents a plasmonic metal–insulator-metal (MIM) waveguide with a cavity, featuring a regular octagon geometry and a silver octagon island, as a new refractive index (RI) sensor. Various structural parameters of the sensor are analyzed, and the optimal structure is achieved based on the Maximum sensitivity. The Maximum RI sensitivity of the optimized structure is 4257 nm/RIU in the mid-infrared (MIR) range and 1337 nm/RIU in the near-infrared (NIR) range. The presented structure also recorded a maximum figure of merit (FoM) of 44.53 1/RIU and a quality factor (QF) of 60.11, with a sensitivity of 1158 nm/RIU in the NIR. This sensor can be employed in bacteria detection, such as <i>Bacillus</i> and <i>E. coli</i>, and bacteria’s cell’s organs detection, such as nucleoid and cytoplasm. Moreover, this sensor illustrates its effectiveness in gas sensing by utilizing the RI modulation of ultraviolet-curable fluoro-siloxane (UVCFS) to monitor trace concentrations of methane and hydrogen. It demonstrates a maximum gas sensitivity (S<sub>g</sub>) of 16.78 nm/% for methane and 4.78 nm/% for hydrogen. Ultimately, the structure failure is analyzed according to corner sharpness during the presumptive manufacturing process. The structure’s stability against corner rounding during manufacturing is also analyzed, showing minimal changes in performance parameters.</p>

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Gas and Bactria Plasmonic Sensor Based on MIM Refractive Index Containing Regular Octagonal Ring-Shaped Cavity

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Kamiyar Rezghy Ilkhchy,
  • Mohammad Ghanavati,
  • Mohammad Azim Karami

摘要

This paper presents a plasmonic metal–insulator-metal (MIM) waveguide with a cavity, featuring a regular octagon geometry and a silver octagon island, as a new refractive index (RI) sensor. Various structural parameters of the sensor are analyzed, and the optimal structure is achieved based on the Maximum sensitivity. The Maximum RI sensitivity of the optimized structure is 4257 nm/RIU in the mid-infrared (MIR) range and 1337 nm/RIU in the near-infrared (NIR) range. The presented structure also recorded a maximum figure of merit (FoM) of 44.53 1/RIU and a quality factor (QF) of 60.11, with a sensitivity of 1158 nm/RIU in the NIR. This sensor can be employed in bacteria detection, such as Bacillus and E. coli, and bacteria’s cell’s organs detection, such as nucleoid and cytoplasm. Moreover, this sensor illustrates its effectiveness in gas sensing by utilizing the RI modulation of ultraviolet-curable fluoro-siloxane (UVCFS) to monitor trace concentrations of methane and hydrogen. It demonstrates a maximum gas sensitivity (Sg) of 16.78 nm/% for methane and 4.78 nm/% for hydrogen. Ultimately, the structure failure is analyzed according to corner sharpness during the presumptive manufacturing process. The structure’s stability against corner rounding during manufacturing is also analyzed, showing minimal changes in performance parameters.