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.

Xiangxian Wang;Jian Zhang;Jiankai Zhu;Zao Yi;Jianli Yu

School of Science,Lanzhou University of Technology,Lanzhou 730050,China;Joint Laboratory for Extreme Conditions Matter Properties,Southwest University of Science and Technology,Mianyang 621010,China;School of Electronic Engineering,Chaohu University,Chaohu 238000,China

中国物理B（英文版）

[1]Xiangxian Wang;Jian Zhang;Jiankai Zhu;Zao Yi;Jianli Yu-.Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film)[J].中国物理B（英文版）,2022(02):416-424

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