DNA-linked metal nanosphere materials: Structural basis for the optical properties
DNA-linked metal nanosphere materials: Structural basis for the optical properties
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DOI：
10.1021/jp992179
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发表时间：
2000-01-27
影响因子：
3.3
通讯作者：
Schatz, GC
中科院分区：
文献类型：
--
作者：
Lazarides, AA;Schatz, GC
The structural basis for the aggregation-induced optical properties of colloidal gold nanosphere aggregates is examined by means of electrodynamics calculations. Recently developed methods for calculating the electrodynamic response of aggregates composed of large numbers of small metal nanospheres in a dielectric medium are used to determine the optical changes associated with the formation of spherical aggregates. The calculations use accurate nanoparticle polarizabilities determined from Mie theory, an iterative conjugate-gradient solution algorithm, and fast-Fourier transform methods for efficient solution of the electrodynamic interacting nanoparticle equations. The UV extinction lowering and the shifting and broadening of the visible plasmon peak observed experimentally in solutions of DNA-linked gold nanospheres are explained as the collective electromagnetic response of thousands of nanoparticles.
