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<p>High-sensitivity plasmonic refractive index sensors play a crucial role in chemical and biological detection. In this work, we propose a novel and compact sensing structure composed of a MIM waveguide coupled with an asymmetric ellipsoidal resonator. Finite element simulations demonstrate that symmetry breaking in the structure enables the excitation of multiple sharp Fano resonances along with a distinct Lorentzian resonance, significantly enriching the spectral response. Compared with conventional symmetric resonator designs, the proposed structure offers three key advantages: (1)&#xa0;support for multiple narrow Fano modes; (2)&#xa0;independent tunability of both Fano and Lorentz peaks; and (3)&#xa0;directional and selective spatial field distributions of coupled modes, enhancing both sensitivity and resolution. By tuning the geometric parameters, precise control over resonance wavelengths is achieved, showing excellent tunability. The structure reaches a high refractive index sensitivity of ~ 1700 nm/RIU and the FOM up to 2.13 × 10<sup>4</sup>. Furthermore, it exhibits pronounced spectral responses to variations in glucose and plasma concentrations, indicating strong potential for label-free biochemical sensing. This study provides a promising strategy for designing multi-channel, high-resolution plasmonic sensors and integrated photonic devices.&#xa0;</p>

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Symmetry Breaking Induced Multiple Fano Resonances for Plasmonic Nanosensing

  • 期刊论文

  • 发表日期：

    2025年5月31日

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  • Haibo Geng,
  • Zhouping Ni,
  • Xinxin Ma,
  • Tong Li,
  • Yilin Wang,
  • Zhao Chen

摘要

High-sensitivity plasmonic refractive index sensors play a crucial role in chemical and biological detection. In this work, we propose a novel and compact sensing structure composed of a MIM waveguide coupled with an asymmetric ellipsoidal resonator. Finite element simulations demonstrate that symmetry breaking in the structure enables the excitation of multiple sharp Fano resonances along with a distinct Lorentzian resonance, significantly enriching the spectral response. Compared with conventional symmetric resonator designs, the proposed structure offers three key advantages: (1) support for multiple narrow Fano modes; (2) independent tunability of both Fano and Lorentz peaks; and (3) directional and selective spatial field distributions of coupled modes, enhancing both sensitivity and resolution. By tuning the geometric parameters, precise control over resonance wavelengths is achieved, showing excellent tunability. The structure reaches a high refractive index sensitivity of ~ 1700 nm/RIU and the FOM up to 2.13 × 104. Furthermore, it exhibits pronounced spectral responses to variations in glucose and plasma concentrations, indicating strong potential for label-free biochemical sensing. This study provides a promising strategy for designing multi-channel, high-resolution plasmonic sensors and integrated photonic devices.