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<p>This study introduces a dual functional plasmonic sensor using a metal insulator metal (MIM) waveguide configuration, which incorporates a square cavity and sidewall grating components. The design facilitates a single, acute resonance peak, making it appropriate for refractive index, methane gas detection and pressure sensitivity. The sensor’s optical response was examined using the finite element technique (FEM). Simulations demonstrate that the sensor has significant refractive index sensitivity, with a measurement of 4061 ± 34.44&#xa0;nm/RIU. This resonance shift is used for methane detection, exhibiting a gas sensitivity of roughly 17&#xa0;nm per percent concentration of CH₄. The sensor exhibits pressure sensing capacity, with a maximum sensitivity of 131.22 ± 3.94&#xa0;nm/MPa. Due to its small design, multifunctional capabilities, and high sensitivity, the suggested sensor is an excellent option for incorporation onto nanoscale platforms for methane detection and pressure monitoring.</p>

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A high-performance dual-purpose plasmonic sensor utilizing MIM structure for methane and pressure sensing

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Anita Gravand,
  • Abdolnaser Zakery,
  • Abbas Ghasempour Ardakani

摘要

This study introduces a dual functional plasmonic sensor using a metal insulator metal (MIM) waveguide configuration, which incorporates a square cavity and sidewall grating components. The design facilitates a single, acute resonance peak, making it appropriate for refractive index, methane gas detection and pressure sensitivity. The sensor’s optical response was examined using the finite element technique (FEM). Simulations demonstrate that the sensor has significant refractive index sensitivity, with a measurement of 4061 ± 34.44 nm/RIU. This resonance shift is used for methane detection, exhibiting a gas sensitivity of roughly 17 nm per percent concentration of CH₄. The sensor exhibits pressure sensing capacity, with a maximum sensitivity of 131.22 ± 3.94 nm/MPa. Due to its small design, multifunctional capabilities, and high sensitivity, the suggested sensor is an excellent option for incorporation onto nanoscale platforms for methane detection and pressure monitoring.