Influence of the Substrate to the LSP Coupling Wavelength and Strength.

Influence of the Substrate to the LSP Coupling Wavelength and Strength.
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基底对LSP耦合波长和强度的影响

DOI:
10.1186/s11671-018-2691-2
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发表时间:
2018-09-10
影响因子:
--
通讯作者:
Kang J
Kang J
中科院分区:
材料科学3区
文献类型:
--
作者:
Liao J;Ji L;Zhang J;Gao N;Li P;Huang K;Yu ET;Kang J

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采用FDTD方法,对基底上的半/球形纳米粒子/纳米粒子二聚体和半埋于基底中的球形纳米粒子/纳米粒子二聚体3种典型结构进行了模拟,从理论上讨论了金属纳米粒子/纳米粒子二聚体位于基底附近时,基底对局域表面等离子体(LSP)耦合的影响.模拟结果表明,不同结构的LSP耦合波长与衬底折射率的依赖关系并不相同,这是由于LSP的偏振场分布不同所致。当光从不同方向入射时,LSP耦合强度也不相同,并且散射峰强度的比率取决于金属纳米颗粒或纳米颗粒二聚体的位置。这一现象可以用空气与衬底界面调制的局部驱动电场强度的差异来解释。
Three kinds of typical structures, hemi-/spherical nanoparticles/nanoparticle dimers on the substrate and spherical nanoparticles/nanoparticle dimers half-buried into the substrate, are used for FDTD simulation to theoretically discuss the influence of the substrate to the localized surface plasmon (LSP) coupling when the metal nanoparticles/nanoparticle dimers are locating near a substrate. Simulated results show that the dependencies between the LSP coupling wavelength and the refractive index of the substrate for different structures are not the same, which can be attributed to the different polarization field distributions of LSPs. When light is incident from different directions, the LSP coupling strength are not the same as well and the ratios of the scattering peak intensities depend on the position of the metal nanoparticles or nanoparticle dimers. These phenomenon can be explained by the difference of the local driving electric field intensities which is modulated by the interface between the air and the substrate.
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