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Wang X X, Chen H W, Zhu J K, et al. Research on surface plasmon refractive index sensing of gold nano cone array and gold film coupling structure[J]. Opto-Electron Eng, 2022, 49(12): 220135. doi: 10.12086/oee.2022.220135
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Research on surface plasmon refractive index sensing of gold nano cone array and gold film coupling structure
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Abstract
A surface plasmon resonance refractive index sensor based on the coupling structure of gold nano cones and a gold film with a SiO2 film as spacer-layer is designed. The surface plasmon resonance modes in the composite structure are studied by using the Finite Difference Time Domain method. The composite structure can stimulate not only localized surface plasmon, but also propagating surface plasmon. The energy of the incident electromagnetic wave is partially coupled to the localized surface plasmon through a single gold nano cone, and partially coupled to the propagating surface plasmon through a grating of gold nano cone array. The reflection spectra of the composite structure are simulated in the refractive index range of 1.30 to 1.40. It is found that the resonance wavelength has a linear relationship with the refractive index of the analyte, and the reflectivity at the resonance is almost zero due to the strong resonance coupling between localized and propagating surface plasmon. In addition, the full width at half maximum of propagating surface plasmon resonance mode is very narrow when the geometric parameters of gold nano cone are optimized. The sensitivity and figure of merit reach 770 nm/RIU and 113 RIU−1 respectively, and it has good refractive index sensing performance. The designed composite structure is expected to be widely used in the field of biochemical detection.-
Keywords:
- gold nano cone /
- gold film /
- surface plasmon /
- refractive index sensing
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References
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Wang X X, Chen H W, Zhu J K, et al. Research on surface plasmon refractive index sensing of gold nano cone array and gold film coupling structure[J]. Opto-Electron Eng, 2022, 49(12): 220135. doi: 10.12086/oee.2022.220135
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Figure 1.
(a) Three dimensional schematic diagram of the composite structure of Au nano cone and Au nano film; (b) A top-down view of the structure, and the red foursquare lattice is the calculation unit
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Figure 2.
Reflection spectra of composite structure of gold nano cone and gold film. The bottom radius, the height and the period of the gold nano cone are 140 nm, 200 nm, 800 nm, and the background refractive index is 1.30
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Figure 3.
Electric field distributions of the composite structure at two modes resonance wavelengths. The bottom radius, the height and the period of gold nano cone are 140 nm, 200 nm and 800 nm. The background refractive index is 1.30. (a) and (d) are the electric field distribution on the x-z plane; (b) and (e) are the electric field distribution on the lower surface of the SiO2 spacer and the interface of the Au film; (c) and (f) are the electric field distribution on the surface above the analyte and the SiO2 spacer; (a), (b) and (c) are mode 1, (d), (e) and (f) are mode 2
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Figure 4.
The background refractive index is 1.30, the reflection spectra of the composite structure under different parameters. (a) D 800 nm, R 140 nm, and H changes from 200 nm to 240 nm; (b) D 800 nm, H 200 nm, and R changes from 100 nm to 180 nm; (c) H 200 nm, R 140 nm, and D changes from 700 nm to 900 nm; (d) Simulation and theoretical values of mode 1 resonance wavelength at various period
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Figure 5.
Reflection spectrum of the composite structure under different refractive index of analyte. The radius of Au nano cone is 140 nm, the height is 200 nm, and the period is 800 nm
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Figure 6.
Relationship curves of reflection spectrum resonance wavelength of the composite structure with refractive index change under different refractive index of object to be measured. The bottom radius of gold nano cone is 140 nm, the height is 200 nm, and the period is 800 nm
