时间：2021年12月7日 星期二 20:00-21:00

地点： 腾讯会议室 174 686 030

报告题目： Fast Algorithms for Maxwell’s Equations for 3D Photonic Crystal

报告人简介：李铁香，东南大学教授，博士研究生导师，东南大学丘成桐中心主任助理，南京应用数学中心主任助理。主要研究方向为大规模矩阵计算及其应用、三维计算共形几何及应用等。目前已经在 SIIMS、SIMAX、JCP、Inverse Problems等学术刊物发表论文50余篇，主持3项国家自然科学基金项目、主持1项国防创新特区项目和1项装备预研项目。2013年获得江苏省科学技术奖（排名五），2014年评为江苏省“青蓝工程”中青年学术带头人，获得了 2017 年和 2019 年世界华人数学家联盟最佳论文奖—“若琳奖”，获得2020年第三届江苏省工业与应用数学学会工业与应用数学青年奖。

内容提要： In this work, we propose the Fast Algorithms for Maxwell's Equations (FAME) package for solving Maxwell's equations for modeling three-dimensional photonic crystals. FAME combines the null-space free method with fast Fourier transform (FFT)-based matrix-vector multiplications to solve the generalized eigenvalue problems (GEPs) arising from Yee's discretization. A GEP is transformed into a null-space free standard eigenvalue problem with a Hermitian positive-definite coefficient matrix. The computation times for FFT-based matrix-vector multiplications with $7$ million matrix dimensions are only $0.33$ and $3.6 \times 10^{-3}$ seconds using MATLAB and a single NVIDIA Tesla P100 GPU, respectively. Such multiplications significantly reduce the computational costs of the conjugate gradient (CG) method for solving linear systems. We successfully use FAME on a single P100 GPU to solve a set of GEPs with more than $19$ million dimensions in $127$ to $191$ seconds per problem. These results demonstrate the potential of our proposed package to enable large-scale numerical simulations for novel physical discoveries and engineering applications of photonic crystals.

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