Sun W, Fu Q, Chen Z
Dalhousie University, Halifax, Nova Scotia B3H 4J1, Canada.
Appl Opt. 1999 May 20;38(15):3141-51. doi: 10.1364/ao.38.003141.
A three-dimensional finite-difference time-domain (FDTD) program has been developed to provide a numerical solution for light scattering by nonspherical dielectric particles. The perfectly matched layer (PML) absorbing boundary condition (ABC) is used to truncate the computational domain. As a result of using the PML ABC, the present FDTD program requires much less computer memory and CPU time than those that use traditional truncation techniques. For spheres with particle-size parameters as large as 40, the extinction and absorption efficiencies from the present FDTD program match the Mie results closely, with differences of less than approximately 1%. The difference in the scattering phase function is typically smaller than approximately 5%. The FDTD program has also been checked by use of the exact solution for light scattering by a pair of spheres in contact. Finally, applications of the PML FDTD to hexagonal particles and to spheres aggregated into tetrahedral structures are presented.
已开发出一种三维时域有限差分（FDTD）程序，用于为非球形介电粒子的光散射提供数值解。采用完全匹配层（PML）吸收边界条件（ABC）来截断计算域。由于使用了PML ABC，当前的FDTD程序比使用传统截断技术的程序所需的计算机内存和CPU时间要少得多。对于粒径参数高达40的球体，当前FDTD程序的消光和吸收效率与米氏结果非常接近，差异小于约1%。散射相函数的差异通常小于约5%。该FDTD程序还通过一对接触球体的光散射精确解进行了检验。最后，展示了PML FDTD在六角形粒子和聚集成四面体结构的球体中的应用。
