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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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摘要:
设计了基于SiO2薄膜间隔的金纳米锥与金薄膜耦合结构表面等离子体共振折射率传感器。使用时域有限差分法研究了复合结构中的表面等离子体共振模式，复合结构不仅能够激发局域表面等离子体共振，也可激发传播表面等离子体共振。入射电磁波的能量部分通过单个金纳米锥耦合到局域表面等离子体，部分通过金纳米锥阵列二维光栅耦合到传播表面等离子体。在待测物折射率1.30~1.40的范围内，对复合结构的反射光谱进行了模拟研究，发现共振波长与分析物折射率呈线性关系，且由于局域和传播表面等离子体的高效激发，反射光谱共振峰处的反射率几乎为零。此外，在最优的金纳米锥几何参数下，传播表面等离子体共振模式的半高全宽非常窄，灵敏度和品质因数分别达到770 nm/RIU和113 RIU−1，具有良好的折射率传感性能。所设计的复合结构作为表面等离子体共振传感器有望广泛应用于生物检测领域。
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.
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Key words:
- gold nano cone /
- gold film /
- surface plasmon /
- refractive index sensing
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图 1 (a) 金纳米锥与金纳米薄膜复合结构三维示意图；(b) 结构俯视图，红色方框为计算单元
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
图 2 金纳米锥与金薄膜复合结构的反射光谱。金纳米锥底面半径为140 nm，高为200 nm，周期为800 nm，背景折射率为1.30
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
图 3 复合结构中两种模式共振波长下的电场分布图。金纳米锥底面半径为140 nm，高度为200 nm，周期为800 nm，背景折射率为1.30. (a)和(d)为x-z平面上的电场分布, (b)和(e)为SiO2间隔层下表面和Au薄膜界面上的电场分布,(c)和(f)为分析物与SiO2间隔层上表面上的电场分布; (a)、(b)、(c)为模式1，(d)、(e)、(f)为模式2
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
图 4 背景折射率1.30，不同参数下复合结构的反射光谱。(a) D为800 nm，R为140 nm，H从200 nm~240 nm；(b) D为800 nm，H为200 nm，R从100 nm~180 nm；(c) H为200 nm，R为140 nm，D从700 nm~900 nm；(d) 不同周期下模式1共振波长的仿真值与理论值
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
图 5 不同分析物折射率下复合结构的反射光谱。金纳米锥的半径为140 nm，高度为200 nm，周期为800 nm
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
图 6 不同待测物折射率下复合结构反射光谱共振波长与折射率变化的关系曲线。金纳米锥的底面半径为140 nm，高度为200 nm，周期为800 nm
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
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