DNA-linked metal nanosphere materials: Fourier-transform solutions for the optical response

A. A. Lazarides, George C Schatz

Research output: Contribution to journalArticle

55 Citations (Scopus)

Abstract

Methods are developed for modeling the optical properties of aggregates of large numbers of small metal nanospheres in a dielectric medium. Aggregates are modeled as systems of coupled dipoles, with the dipole polarizabilities for the spheres determined using Mie theory. Fast-Fourier-transform (FFT) and conjugate-gradient (CG) techniques are used to solve the electrodynamic equations for both ordered and disordered aggregates. Results are shown to match solutions arrived at by direct methods. The range of validity of the coupled-dipole approximation for modeling DNA-linked colloidal materials is established by comparison with coupled-multipole results. While the methods are applicable only to lattice gas aggregates and aggregates composed of nanospheres on cubic lattices, there are no restrictions as to aggregate shape.

Original languageEnglish
Pages (from-to)2987-2993
Number of pages7
JournalJournal of Chemical Physics
Volume112
Issue number6
DOIs
Publication statusPublished - Feb 8 2000

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Nanospheres
Fourier transforms
deoxyribonucleic acid
Metals
DNA
metals
dipoles
Electrodynamics
Mie scattering
cubic lattices
electrodynamics
Fast Fourier transforms
multipoles
constrictions
Optical properties
Gases
optical properties
gradients
approximation
gases

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

DNA-linked metal nanosphere materials : Fourier-transform solutions for the optical response. / Lazarides, A. A.; Schatz, George C.

In: Journal of Chemical Physics, Vol. 112, No. 6, 08.02.2000, p. 2987-2993.

Research output: Contribution to journalArticle

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