中国物理B ›› 2022, Vol. 31 ›› Issue (2): 24210-024210.doi: 10.1088/1674-1056/ac3816

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Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film

Xiangxian Wang(王向贤)1,†, Jian Zhang(张健)1, Jiankai Zhu(朱剑凯)1, Zao Yi(易早)2, and Jianli Yu(余建立)3   

  1. 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
  • 收稿日期:2021-09-14 修回日期:2021-11-03 接受日期:2021-11-10 出版日期:2022-01-13 发布日期:2022-01-22
  • 通讯作者: Xiangxian Wang E-mail:wangxx869@lut.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 61865008) and the Hong Liu FirstClass Disciplines Development Program of Lanzhou University of Technology.

Refractive index sensing of double Fano resonance excited by nano-cube array coupled with multilayer all-dielectric film

Xiangxian Wang(王向贤)1,†, Jian Zhang(张健)1, Jiankai Zhu(朱剑凯)1, Zao Yi(易早)2, and Jianli Yu(余建立)3   

  1. 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
  • Received:2021-09-14 Revised:2021-11-03 Accepted:2021-11-10 Online:2022-01-13 Published:2022-01-22
  • Contact: Xiangxian Wang E-mail:wangxx869@lut.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 61865008) and the Hong Liu FirstClass Disciplines Development Program of Lanzhou University of Technology.

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摘要： 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.

关键词: Fano resonance, refractive index, nano-cube array, all-dielectric film

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.

Key words: Fano resonance, refractive index, nano-cube array, all-dielectric film

中图分类号:  (Wave propagation, transmission and absorption)

  • 42.25.Bs
42.25.-p (Wave optics) 42.79.-e (Optical elements, devices, and systems)