Computation of tightly-focused laser beams in the FDTD method

被引：34

作者：

Capoglu, Ilker R. ^{[1
]}

Taflove, Allen ^{[2
]}

Backman, Vadim ^{[1
]}

机构：

[1] Northwestern Univ, Dept Biomed Engn, Evanston, IL 60208 USA

[2] Northwestern Univ, Dept Elect Engn & Comp Sci, Evanston, IL 60208 USA

来源：

OPTICS EXPRESS | 2013年 / 21卷 / 01期

基金：

美国国家科学基金会;

关键词：

MONOMIAL CUBATURE RULES; ELECTROMAGNETIC DIFFRACTION; OPTICAL SYSTEMS; STROUD; FIELD;

D O I：

10.1364/OE.21.000087

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate how a tightly-focused coherent TEMmn laser beam can be computed in the finite-difference time-domain (FDTD) method. The electromagnetic field around the focus is decomposed into a plane-wave spectrum, and approximated by a finite number of plane waves injected into the FDTD grid using the total-field/scattered-field (TF/SF) method. We provide an error analysis, and guidelines for the discrete approximation. We analyze the scattering of the beam from layered spaces and individual scatterers. The described method should be useful for the simulation of confocal microscopy and optical data storage. An implementation of the method can be found in our free and open source FDTD software ("Angora"). (C) 2013 Optical Society of America

引用

页码：87 / 101

页数：15

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