强激光与粒子束, 2018, 30 (4): 043101, 网络出版: 2018-05-04
电子激励表面等离极化激元的粒子模拟
Particle-in-cell simulation of electron-excited surface plasmon polaritons
贵金属 时域有限差分法 粒子模拟 电子 表面等离极化激元 noble metal finite-difference time-domain method particle-in-cell simulation electron surface plasmon polaritons
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。
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.
刘腊群, 张平, 王辉辉. 电子激励表面等离极化激元的粒子模拟[J]. 强激光与粒子束, 2018, 30(4): 043101. Liu Laqun, Zhang Ping, Wang Huihui. Particle-in-cell simulation of electron-excited surface plasmon polaritons[J]. High Power Laser and Particle Beams, 2018, 30(4): 043101.
PDF全文
