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Simulated Optical Properties of Gold Nanocubes and Nanobars by Discrete Dipole Approximation

Title:

Simulated Optical Properties of Gold Nanocubes and Nanobars by Discrete Dipole Approximation

Alsawafta, Mohammed and Wahbeh, Mamoun and Truong, Vo-Van (2012) Simulated Optical Properties of Gold Nanocubes and Nanobars by Discrete Dipole Approximation. Journal of Nanomaterials, 2012 . ISSN 1687-4110

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Official URL: http://dx.doi.org/10.1155/2012/283230

Abstract

The absorption spectra for a gold nanocube and for a gold nanobar are calculated by using the Discrete Dipole Approximation (DDA). The results show the excitation of a single albeit broad surface plasmon (SP) band of the gold nanocube. The extinction cross section of the gold nanocube is dominated by the absorption cross section that gains importance as the width increases. Further increasing the nanocube size beyond 80 nm will result in an optical response mainly characterized by scattering properties. The absorption spectrum of the nanobar shows the excitation of both the longitudinal mode (LM) and the transverse mode (TM). The nanobar is also compared to a cylinder, a spherically capped cylinder, and a spheroid of the same aspect ratio. The band position of the TM of the nanobar is red-shifted as compared to the ones calculated for other morphologies, while the LM is either blue-shifted or red-shifted depending on the morphologies considered.

Divisions:Concordia University > Faculty of Arts and Science > Physics
Item Type:Article
Refereed:Yes
Authors:Alsawafta, Mohammed and Wahbeh, Mamoun and Truong, Vo-Van
Journal or Publication:Journal of Nanomaterials
Date:2012
ID Code:973684
Deposited By:KATHARINE HALL
Deposited On:31 Jul 2012 12:18
Last Modified:31 Jul 2012 12:18
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