讲座题目：
Particle-in-Cell (PIC) Simulations for Next-Gen Nanoscopic Photonics and Plasmonics
面向下一代纳米光子–等离激元学的Particle-in-Cell (PIC)模拟
时间：2025年8月14日 上午9:00-10:30
地点：兴庆校区教二南楼电子物理所206会议室
报告人：WU Lin（吴琳）副教授
新加坡科技设计大学
Abstract: Computational simulations have revolutionized electromagnetism, particularly in modeling dynamic materials like quantum plasmas, where electron dynamics play a pivotal role. Traditional methods such as Finite-Difference Time-Domain (FDTD) and Finite Element Method (FEM) struggle in these scenarios, whereas the Particle-in-Cell (PIC) method is well-suited for time-dependent simulations, allowing for self-consistent modeling of both the electromagnetic field and particle motion. We apply PIC simulations to explore graphene antennas and nonlinear electron transport in graphene plasmon resonators, uncovering novel even-order nonlinearities for frequency-tunable infrared upconversion. Specifically, we propose a mechanism for second-harmonic generation via electron funnelling in THz optical resonators, where femtosecond electron-surface scattering significantly reduces the required field intensity for second-harmonic generation by 3-4 orders of magnitude. This work offers design guidelines for geometrically tunable THz upconversion and rectification, effective across a broad range from sub-10 THz to tens of THz in graphene. Room-temperature metals and semi-metals, functioning as cold quantum plasmas, pave the way for next-generation nanoscopic studies in photonics and plasmonics, opening new avenues for low-field, high-efficiency photonic applications.
[1] Particle simulation of plasmons. Nanophotonics, Vol. 9, No. 10, 3303-3313, 2020.
[2] Electron dynamics in plasmons. Nanoscale, Vol. 13, 2801-2810, 2021.
[3] Nonlinear optical resonances from ballistic electron funnelling. ACS Nano, Vol.19, No, 14, 14150 – 14160, 2025. https://doi.org/10.1021/acsnano.5c00169.
[4] Particle-in-cell simulations of quantum plasmas. Computer Physics Communications (under review), arXiv:2501.07465.
报告人简介: 吴琳，新加坡科技设计大学副教授。分别于2005和2009年在新加坡南洋理工大学获得学士（1st class Honour）和博士学位。2009到2021年，工作于新加坡科技局高性能科学计算所。 2021年11月加入新加坡科技设计大学数理与科技学院。研究兴趣包括纳米光学、纳米等离激元学以及量子光学中的理论探索与传感应用，在Science, Nature Photonics等高水平学术期刊发表论文100余篇，合著书籍3本，授权美国专利4项。学术兼职包括担任IEEE of Singapore Section, Nuclear and Plasma Sciences Society主席，《Optics Express》副编辑（Associate Editor），以及《APL Quantum》咨询编委（Editorial Advisory Board）等。
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