Abstract
Surface Plasmon Resonance (SPR) sensors are a useful tool for biomolecule detection, offering label-free and real-time monitoring characteristics. However, traditional SPR sensors still face the challenges of limited detection sensitivity, especially for sensing small molecules with a low concentration level (less than 1 pM (10−12 mol/L)). To overcome this challenge, in this paper, we designed a Kretschmann configuration which uses a plasmonic waveguide to generate a powerful Fano resonance through the coupling of the surface plasmon polariton (SPP) mode and photonic waveguide (PWG) mode at the sensing interface. By optimizing the thickness of the layers of the metamaterial structure, it is also possible to adjust the resonance angle, the reflectivity, the quality factor (Q factor), the intensity sensitivity, the angular sensitivity and the detection range. In our designed subwavelength grating waveguides (SWG) structure sensor, the intensity sensitivity reached 1.808 × 104 RIU−1, which surpassed the intensity sensitivity of uniform Si layers by 5.14 times. This approach provides a framework for physicists and biologists to develop the future generation of medical diagnostic devices.
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No datasets were generated or analysed during the current study.
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K.C. and X.L. contributed to the simulation, data curation, formal analysis and visualization. T.H., Y.W. and S.Z. contributed to the conceptualization, investigation, validation and supervision. The first draft of the manuscript was written by K.C. and X.L, revised by T.H., Y.W. and S.Z. All authors read and approved the final manuscript.
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Kaifu Chen and **ngbing Li contributed equally to this work.
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Chen, K., Li, X., Huang, T. et al. Fano Resonance-Plasmonic Biosensors Based on Strong Coupling of Hybrid Plasmonic-Photonic Modes. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02216-5
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DOI: https://doi.org/10.1007/s11468-024-02216-5