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Baffle Induced Sensing Enhancement for Pressure and Refractive Index Based on Fano Resonance

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Abstract

The sensitivity of plasma devices in pressure sensing has been undergoing significant advancements. However, the quantitative relationship between the actual deformation of the structure and the resulting optical transmission characteristics has not yet been investigated in depth. In this study, we propose a novel metal–insulator-metal (MIM) waveguide structure that exhibits a distinct transmission spectrum featuring a sharp Fano line. Notably, the incorporation of a baffle into the resonator induces the formation of a double Fano resonance, which occurs irrespective of the presence of external pressure. Remarkably, the second Fano resonance (FR2), effectively enhances the refractive index sensitivity of the system from 1400 nm/RIU to 1600 nm/RIU when the baffle is integrated into the pressure-free resonator. Furthermore, the introduction of a baffle into the pressurized cavity significantly improves the pressure sensitivity of the system. Specifically, the first Fano resonance (FR1) increases the pressure sensitivity from 2.40 nm/MPa to 6.88 nm/MPa, making it a multifunctional plasma device that functions as both an optical pressure sensor and a refractive index sensor.

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Data Availability

Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Funding

Fundamental Research Funds for the Central Universities (buctrc202143), the Program of State Key Laboratory of Quantum Optics and Quantum Optics Devices (No. KF202202), the National Natural Science Foundation of China (NSFC) (Grant No. 62175010, 12174037, 11974225, 12204030).

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Authors and Affiliations

  1. College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing, 100029, China

    Xinxin Ma, Tong Li, Yilin Wang & Zhao Chen

  2. State Key Laboratory of Quantum Optics and Quantum Optics Devices, Shanxi University, Taiyuan, 030006, China

    Zhao Chen

Authors
  1. Xinxin Ma
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  2. Tong Li
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  3. Yilin Wang
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  4. Zhao Chen
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Contributions

M.X. wrote the main manuscript text and C.Z. examined the manuscript. W.Y and L.T. prepared figures 1-3. All authors reviewed the manuscript.

Corresponding author

Correspondence to Zhao Chen.

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The authors declare no competing interests.

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Appendix 

Appendix 

As shown in Fig. 6, when a baffle with width a = 100 nm and height b = 100 nm-200 nm is added, the transmission spectrum generated by the system still maintains the combination pattern of Lorentz peak and Fano peak. The bottom of the baffle is confined to the top of the waveguide, and with the increase of the height b value to 300 nm, the Lorentz peak causes splitting, and the energy in the resonator moves and is redistributed. 

Fig. 6
figure 6

The transmission spectrum changes from nonexistent to existent

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Ma, X., Li, T., Wang, Y. et al. Baffle Induced Sensing Enhancement for Pressure and Refractive Index Based on Fano Resonance. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02262-z

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  • DOI: https://doi.org/10.1007/s11468-024-02262-z

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