Abstract
In recent years, sensing structures based on Fano resonances have become a hot research topic. In this study, a coupled structure, composed of a metal baffle metal-insulator-metal waveguide and an asymmetric cross-shaped resonator, is designed. By changing the coupling distance and asymmetry of the cross-shaped resonator, their influences on the transmission and electromagnetic field distribution were calculated and systematically analyzed. The results showed a good linear relationship between the center wavelength of the Fano transmission peak and the refractive index of the filled material. The sensor sensitivity can reach 795 nm/RIU. The prospective applications of this waveguide structure are promising. The structure can also provide a future reference for the design of a microwave waveguide structure.
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This project is supported by National Natural Science Foundation of China (Grant No. 51965007).
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Suchang and JUN ZHU contributed equally to this work. Su Chang, Li Na, and Jun Zhu drafted the manuscript. Su Chang participated in the design of the study and performed the statistical analysis. All authors read and approved the final manuscript.
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Su, C., Zhu, J. Novel SPR Sensor Based on MIM-based Waveguide and an Asymmetric Cross-shaped Resonator. Plasmonics 16, 769–775 (2021). https://doi.org/10.1007/s11468-020-01348-8
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DOI: https://doi.org/10.1007/s11468-020-01348-8