中国光学2023，Vol.16Issue(4)：961-971,11.DOI:10.37188/CO.EN-2023-0008
基于Au纳米平行双棒超表面阵列的双Fano共振和折射率传感器特性研究
Double Fano resonance and refractive index sensors based on parallel-arranged Au nanorod dimer metasurface arrays
摘要
Abstract
In order to study the coupling and refractive index sensing properties of a metasurface,asymmet-ric 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 approxima-tion 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 trans-mission spectra are studied.The electric field distribution is simulated at the resonance wavelength,the elec-tron vibration mode is analyzed,and asymmetric double Fano resonance appears in the transmission spec-trum.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 re-fractive index of the surrounding medium.The sensitivity of the refractive index based on the Fano reson-ance can reach 1.137 μm/RIU.These results provide a theoretical basis for the design of a surface plasmon refractive index sensor.关键词
等离激元超表面/Au纳米棒/双Fano共振/折射率传感器Key words
plasmonic metasurfaces/Au nanorods/double Fano resonance/refractive index sensor分类
信息技术与安全科学引用本文复制引用
张志东,张慧男,梁洁,盖海霞,刘艳莉,朱旭鹏..基于Au纳米平行双棒超表面阵列的双Fano共振和折射率传感器特性研究[J].中国光学,2023,16(4):961-971,11.基金项目
国家自然基金项目(No.12004150) （No.12004150）
山西省高等学校科技创新项目(No.2020L0316) （No.2020L0316）
广东省基础与应用基础研究基金(No.2020A1515110998)Supported by the National Natural Science Foundation of China(No.12004150) （No.2020A1515110998）
Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(No.2020L0316) （No.2020L0316）
the Guangdong Basic and Applied Basic Research Foundation(No.2020A1515110998) （No.2020A1515110998）
