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<p>A plasmonic sensor based on a Metal–Insulator-Metal waveguide integrated with a ring cavity, a semicircular rectangular cavity and a T-shaped cavity is proposed for multi-parameter sensing. Using the finite element method, the transmission spectrum and magnetic field distribution are analyzed. The independent tunability of three resonance modes is demonstrated by adjusting structural parameters and refractive indices. The sensor achieves sensitivities of 1350 nm/RIU, 1725 nm/RIU and 2450 nm/RIU for three modes, respectively. Moreover, leveraging the independent tunability, the sensor demonstrates simultaneous detection capabilities for voltage, concentration, and temperature with sensitivities of 8 nm/V, 3.5 nm/%, and -1.1 nm/℃. This work presents a highly efficient plasmonic sensor capable of detecting multiple parameters simultaneously, that offers potential applications in biomedical diagnostics and environmental monitoring.</p>

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Plasmonic Sensor with Independently Tunable Resonances for Simultaneous Detection of Voltage, Concentration, and Temperature

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • Yongpeng Ren,
  • Yiping Sun,
  • Fumeng Qin,
  • Desheng Qu,
  • Chunlei Li

摘要

A plasmonic sensor based on a Metal–Insulator-Metal waveguide integrated with a ring cavity, a semicircular rectangular cavity and a T-shaped cavity is proposed for multi-parameter sensing. Using the finite element method, the transmission spectrum and magnetic field distribution are analyzed. The independent tunability of three resonance modes is demonstrated by adjusting structural parameters and refractive indices. The sensor achieves sensitivities of 1350 nm/RIU, 1725 nm/RIU and 2450 nm/RIU for three modes, respectively. Moreover, leveraging the independent tunability, the sensor demonstrates simultaneous detection capabilities for voltage, concentration, and temperature with sensitivities of 8 nm/V, 3.5 nm/%, and -1.1 nm/℃. This work presents a highly efficient plasmonic sensor capable of detecting multiple parameters simultaneously, that offers potential applications in biomedical diagnostics and environmental monitoring.