Electron Energy-Loss Spectroscopy Calculation in Finite-Difference Time-Domain Package
Electron Energy-Loss Spectroscopy Calculation in Finite-Difference Time-Domain Package
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DOI：
10.1021/ph500408e
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发表时间：
2015-03-01
期刊：
影响因子：
7
通讯作者：
Nordlander, Peter
中科院分区：
文献类型：
--
作者：
Cao, Yang;Manjavacas, Alejandro;Nordlander, Peter
电子能量损失谱(EELS)是一种被广泛用于研究金属纳米结构的等离子体响应的独特工具。本文提出了一种利用时域有限差分(FDTD)方法(EELS-FDTD)计算EELS的新方法。我们通过与成熟的边界元方法(BEM)的结果和已发表的实验结果的直接比较来对我们的方法进行基准测试。特别是，我们计算了球形纳米粒子、纳米粒子二聚体、由不同衬底支撑的纳米盘以及氮化硅衬底上的金蝴蝶结天线的电致发光光谱。我们的EELS-FDTD方法可以很容易地扩展到更复杂的几何和构型。这种实现也可以直接导出到FDTD框架之外，并在其他麦克斯韦方程解算器中实现。
Electron energy-loss spectroscopy (EELS) is a unique tool that is extensively used to investigate the plasmonic response of metallic nanostructures. We present here a novel approach for EELS calculations using the finite-difference time-domain (FDTD) method (EELS-FDTD). We benchmark our approach by direct comparison with results from the well-established boundary element method (BEM) and published experimental results. In particular, we compute EELS spectra for spherical nanoparticles, nanoparticle dimers, nanodisks supported by various substrates, and a gold bowtie antenna on a silicon nitride substrate. Our EELS-FDTD method can be easily extended to more complex geometries and configurations. This implementation can also be directly exported beyond the FDTD framework and implemented in other Maxwell's equation solvers.