Citation: | ZHANG Zhi-dong, ZHANG Hui-nan, LIANG Jie, GE Hai-xia, LIU Yan-li, ZHU Xu-peng. Double Fano resonance and refractive index sensors based on parallel-arranged Au nanorod dimer metasurface arrays[J].Chinese Optics, 2023, 16(4): 961-971.doi:10.37188/CO.EN-2023-0008 |
In order to study the coupling and refractive index sensing properties of a metasurface, asymmetric parallel nanorod dimers consisting of two nanorods with different lengths was proposed and designed. In this paper, the finite element method is used to simulate the optical properties and a quasi-static approximation model is used to explain the coupling mechanism of double parallel nanorods. The transmission spectra, electric field at the resonant peak, charge distribution and the influence of structural parameters on the transmission spectra are studied. The electric field distribution is simulated at the resonance wavelength, the electron vibration mode is analyzed, and asymmetric double Fano resonance appears in the transmission spectrum. The results show that the double Fano resonance is generated by the coupling between the nanorods and the substrate, and the double Fano resonance can be regulated by the structural parameters and the refractive index of the surrounding medium. The sensitivity of the refractive index based on the Fano resonance can reach 1.137 μm/RIU. These results provide a theoretical basis for the design of a surface plasmon refractive index sensor.
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