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<p>In this article, we design a composite groove structured plasmonic resonator with multiple excitation modes. We investigate performance of resonators via key parameters such as feeding method, <i>S</i> parameter, coupling efficiency, quality factor <i>Q</i>, and figure of merit (FoM). The resonator exhibits extremely sensitive to the permittivity covering its surface, based on which we propose a real-time high-sensitivity sensor for permittivity detection. The sensitivity of the LCPR sensor peaks at 435 MHz/RIU (for materials with a permittivity of 1–2) and still reaches a remarkable level of 315 MHz/RIU for materials with a permittivity of 2–4. Additionally, we incorporate slots to modify the sensor. When two slots are symmetrically introduced around the microstrip lines, the FoM value of the quadrupole mode substantially increases from 241 to 534, representing a 122% improvement, while the sensitivity remains virtually unchanged at 307 MHz/RIU. The sensor, fabricated with standard printed circuit board (PCB) technology, combines low cost, high usability, and immense potential for microwave non-destructive testing, thanks to its exceptionally dielectric sensitivity.</p>

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Dual-Slot Induced Mode Coupling in Composite-Groove Plasmonic Resonators for High-FoM Permittivity Sensing

  • 期刊论文

  • 发表日期：

    2025年7月4日

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  • Zhenhong Shui,
  • Minzhe Hu,
  • Chaobiao Zhou,
  • Lepeng Zhang,
  • Jie Xu

摘要

In this article, we design a composite groove structured plasmonic resonator with multiple excitation modes. We investigate performance of resonators via key parameters such as feeding method, S parameter, coupling efficiency, quality factor Q, and figure of merit (FoM). The resonator exhibits extremely sensitive to the permittivity covering its surface, based on which we propose a real-time high-sensitivity sensor for permittivity detection. The sensitivity of the LCPR sensor peaks at 435 MHz/RIU (for materials with a permittivity of 1–2) and still reaches a remarkable level of 315 MHz/RIU for materials with a permittivity of 2–4. Additionally, we incorporate slots to modify the sensor. When two slots are symmetrically introduced around the microstrip lines, the FoM value of the quadrupole mode substantially increases from 241 to 534, representing a 122% improvement, while the sensitivity remains virtually unchanged at 307 MHz/RIU. The sensor, fabricated with standard printed circuit board (PCB) technology, combines low cost, high usability, and immense potential for microwave non-destructive testing, thanks to its exceptionally dielectric sensitivity.