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<p>In this study, we propose and numerically investigate a plasmonic refractive index (RI) sensor based on a metal–insulator–metal (MIM) waveguide coupled with a nanodisk resonator using the Finite-Difference Time-Domain (FDTD) method. The transmission response of the sensor is shown to be tunable through variations in the structural parameters. Simulation results reveal that the resonance wavelengths exhibit an approximately linear dependence on the refractive index of the surrounding dielectric medium. To achieve multimode and tunable sensing capabilities, semi-ring resonators were integrated into the original nanodisk configuration. The resulting multimode structure demonstrates distinct spectral responses governed by its geometric parameters. Moreover, the resonance modes are highly sensitive to changes in the refractive index of the sensing environment. The optimized design achieves a maximum sensitivity of 1516.66&#xa0;nm/RIU and a figure of merit (FOM) of 123.5. These findings suggest that the proposed structure offers promising potential for the development of high-performance, compact refractive index sensors for nanoscale sensing applications.</p>

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Plasmonic Metal–Insulator–Metal Filter and Refractive Index Sensor Based on Semi-Rings Coupled to a Disk Resonator

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Maryam Babaie,
  • Majid Afsahi,
  • Mohammad Danaie

摘要

In this study, we propose and numerically investigate a plasmonic refractive index (RI) sensor based on a metal–insulator–metal (MIM) waveguide coupled with a nanodisk resonator using the Finite-Difference Time-Domain (FDTD) method. The transmission response of the sensor is shown to be tunable through variations in the structural parameters. Simulation results reveal that the resonance wavelengths exhibit an approximately linear dependence on the refractive index of the surrounding dielectric medium. To achieve multimode and tunable sensing capabilities, semi-ring resonators were integrated into the original nanodisk configuration. The resulting multimode structure demonstrates distinct spectral responses governed by its geometric parameters. Moreover, the resonance modes are highly sensitive to changes in the refractive index of the sensing environment. The optimized design achieves a maximum sensitivity of 1516.66 nm/RIU and a figure of merit (FOM) of 123.5. These findings suggest that the proposed structure offers promising potential for the development of high-performance, compact refractive index sensors for nanoscale sensing applications.