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Journal of Nanomaterials
Volume 2014, Article ID 650359, 9 pages
http://dx.doi.org/10.1155/2014/650359
Research Article

Effect of Chromium Interlayer Thickness on Optical Properties of Au-Ag Nanoparticle Array

1Department of Physics, Xiamen University, Xiamen, Fujian 361005, China
2School of Information Engineering, Jimei University, Xiamen, Fujian 361021, China
3China-Australia Joint Laboratory for Functional Nanomaterials, Xiamen University, Xiamen, Fujian 361005, China
4ARC Centre of Excellence for Functional Nanomaterials, University of Queensland, St Lucia, Brisbane, QLD 4072, Australia

Received 12 June 2014; Accepted 4 August 2014; Published 19 August 2014

Academic Editor: Fu-Ken Liu

Copyright © 2014 Jing Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The effect of chromium interlayer thickness on optical properties of array of hybrid Au-Ag triangular nanoparticles is systematically investigated. The optical spectrum simulated by discrete dipole approximation (DDA) numerical method shows that with increase of the chromium interlayer thickness both refractive index sensitivity (RIS) and figure of merit (FOM) of localized surface plasmon resonance from the hybrid nanostructures experience remarkable change and the intensity of the extinction efficiency decreases. The nanosphere lithography (NSL) is used to fabricate the hybrid nanostructure arrays with different chromium interlayer thicknesses. The experiment demonstrates that the spectrum as measured from the as-fabricated hybrid nanostructure arrays is essentially in agreement with the simulated results.