Volume 16Issue 4
Jul. 2023
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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
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

Double Fano resonance and refractive index sensors based on parallel-arranged Au nanorod dimer metasurface arrays

doi:10.37188/CO.EN-2023-0008
Funds:Supported by the National Natural Science Foundation of China (No.12004150); Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi (No. 2020L0316); the Guangdong Basic and Applied Basic Research Foundation (No. 2020A1515110998)
More Information
  • Author Bio:

    ZHANG Zhi-dong (1985—), male, born in Jingle, Shanxi Province, Doctor, graduate student supervisor, received his Ph. D in electromagnetic field and microwave technology from Southwest Jiaotong University in 2014. He is currently an associate Professor at the school of Instrumentation and Electronics of North University of China,and he is the member of the Key Laboratory of Instrumentation Science & Dynamic Measurement of Ministry of Education. His research interests include micro/nanosensors and nanophotonics. E-mail:zdzhang@nuc.edu.cn

    LIU Yan-Li (1985—), female, born in huaibei, Anhui Province, Doctor, received her Ph. D degree from North University of China. She is an Associate Professor at the School of Information and Communication Engineering, of North University of China. Her current research interests include micro/nano-photonics. E-mail:565347436@qq.com

    ZHU Xu-peng (1992—), male, born in Tianshui, Gansu Province, Doctor, received his Ph. D degree from Hunan University in 2018. Currently, he is an associate professor in physics at the School of Physics Science and Technology of Lingnan Normal University. His current research is focused on the surface plasmon effects of multiscale metallic micro–nanostructures. E-mail:zhuxp18@lingnan.edu.cn

  • Corresponding author:565347436@qq.com;zhuxp18@lingnan.edu.cn
  • Received Date:23 Apr 2023
  • Rev Recd Date:18 May 2023
  • Available Online:17 Jun 2023
  • 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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