DISCRETE DIPOLE APPROXIMATION FOR CALCULATING EXTINCTION AND RAMAN INTENSITIES FOR SMALL PARTICLES WITH ARBITRARY SHAPES

被引:437
作者
YANG, WH
SCHATZ, GC
VANDUYNE, RP
机构
[1] Department of Chemistry, Northwestern University, Evanston
关键词
D O I
10.1063/1.469787
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present a discrete dipole approximation (DDA) method to determine extinction and Raman intensities for small metal particles of arbitrary shape. The Raman intensity calculation involves evaluation of surface electromagnetic fields, and thus is relevant to surface enhanced Raman scattering (SERS) intensities. We demonstrate convergence of the method by considering light absorption and scattering from an isolated spheroid, from an isolated tetrahedron, from two coupled spheroids, and from a spheroid on a flat surface. We also examine comparisons with traditional T-matrix methods. Extensions and simplifications of the method in studies of clusters and arrays of particles are presented. (C) 1995 American Institute of Physics.
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页码:869 / 875
页数:7
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