Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film |
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Authors: | Xiangxian Wang Jian Zhang Jiankai Zhu Zao Yi Jianli Yu |
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Institution: | 1.School of Science, Lanzhou University of Technology, Lanzhou 730050, China;2.Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China;3.School of Electronic Engineering, Chaohu University, Chaohu 238000, China |
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Abstract: | We propose a hybrid structure of a nano-cube array coupled with multilayer full-dielectric thin films for refractive index sensing. In this structure, discrete states generated by two-dimensional grating and continuous states generated by a photonic crystal were coupled at a specific wavelength to form two Fano resonances. The transmission spectra and electric field distributions of the structure were obtained via the finite-difference time-domain method. We obtained the optimal structural parameters after optimizing the geometrical parameters. Under the optimal parameters, the figure of merit (FOM) values of the two Fano resonances reached 1.7×104 and 3.9×103, respectively. These results indicate that the proposed structure can achieve high FOM refractive index sensing, thus offering extensive application prospects in the biological and chemical fields. |
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Keywords: | Fano resonance refractive index nano-cube array all-dielectric film |
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