电子激励表面等离极化激元的粒子模拟

刘腊群; 张平; 王辉辉

doi:10.11884/HPLPB201830.170399

电子激励表面等离极化激元的粒子模拟

doi: 10.11884/HPLPB201830.170399

电子科技大学物理电子学院, 成都 610054

基金项目:

国家自然科学基金项目 11705024

国家自然科学基金项目 61501094

详细信息

作者简介:
刘腊群(1984－), 男，讲师，从事粒子模拟技术研究；liulq@uestc.edu.cn

中图分类号: O463
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- 被引次数: 0
出版历程
- 收稿日期: 2017-10-12
- 修回日期: 2017-11-23
- 刊出日期: 2018-04-15

Particle-in-cell simulation of electron-excited surface plasmon polaritons

School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China

摘要

摘要: 采用极化电流微分方程，对贵金属中自由电子与外电场的共振过程进行描述。将该微分方程与麦克斯韦方程相结合，运用时域有限差分(FDTD)方法，在粒子PIC模拟软件CHIPIC3D的基础上，实现了电子激励表面等离极化激元(SPPs)的模拟。通过对100 keV电子平行于银薄膜表面运动、激励起表面等离极化激元的模拟，观测并分析了SPPs的场强及模式在银薄膜表面的分布，并验证了模拟结果的正确性。
- 贵金属 /
- 时域有限差分法 /
- 粒子模拟 /
- 电子 /
- 表面等离极化激元
Abstract: The resonance process of free electrons and external electric fields in noble metal (Ag) is described by using the polarization current difference equation. The difference equation is combined with the Maxwell equation. The finite-difference time-domain (FDTD) method is used. Based on the particle-in-cell (PIC) simulation software CHIPIC3D, the PIC simulation of the electron-excited surface plasmon polaritons (SPPs) is realized. Through simulating the SPPs excited by 100 keV electrons moving parallel to the surface of silver films, the field strength and mode of SPPs are observed and analyzed, and the simulation results are verified.
- noble metal /
- finite-difference time-domain method /
- particle-in-cell simulation /
- electron /
- surface plasmon polaritons

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图 1 三维模拟模型

Figure 1. Three-dimensional simulation model

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图 2 银薄膜厚度20 nm时的模拟结果

Figure 2. Simulation results for silver film thickness of 20 nm

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图 3 银薄膜厚度50 nm时的模拟结果

Figure 3. Simulation results for silver film thickness of 50 nm

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图 4 PIC模拟结果与理论色散曲线结果的对比

Figure 4. Comparison between PIC simulation results and theoretical dispersion curves

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参考文献(11)

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