Full-wave electromagentic analysis of a plasmonic nanoparticle separated from a plasmonic film by a thin spacer layer.
Full-wave electromagentic analysis of a plasmonic nanoparticle separated from a plasmonic film by a thin spacer layer.
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DOI：
10.1364/oe.22.019970
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发表时间：
2014-08
期刊：
影响因子：
3.8
通讯作者：
Rahul Trivedi;Arun Thomas;A. Dhawan
中科院分区：
文献类型：
--
作者：
Rahul Trivedi;Arun Thomas;A. Dhawan
本文对等离子体纳米粒子-间隔物-等离子体膜系统的电磁响应进行了理论分析。该物理系统由等离子体材料(如金或银)的球形纳米颗粒覆盖在等离子体金属薄膜上，并由介电间隔材料与其分开。本文给出了麦克斯韦方程的完整解析解，从而确定了金纳米粒子附近的光场。研究发现，等离子体纳米粒子和等离子体薄膜之间的电磁场对纳米粒子和等离子体薄膜之间的间距非常敏感。这可以使这样的系统能够用于各种传感应用。我们的分析还考虑了等离子体介质的非局域性质，并研究了它对系统共振的影响。将解析解与一种独立的数值方法--时域有限差分方法进行了比较，验证了该解析解的准确性。
This paper presents a theoretical analysis of the electromagnetic response of a plasmonic nanoparticle-spacer-plasmonic film system. The physical system consists of a spherical nanoparticle of a plasmonic material such as gold or silver over a plasmonic metal film and separated from the same by a dielectric spacer material. This paper presents a complete analytical solution of the Maxwell's equations, to determine the optical fields near the gold nanoparticle. It was found that the electromagnetic fields in between the plasmonic nanoparticle and the plasmonic film are extremely sensitive to the spacing between the nanoparticle and the film. This could enable the use of such a system for various sensing applications. The non-local nature of the plasmonic medium was also included in our analysis and it's effect on the resonances of the system was studied. The analytical solution was compared with an independent numerical method, the Finite Difference Time Domain (FDTD) method, to demonstrate the accuracy of the solution.