Abstract
Gold cuboid nanostructures with edge size in the range of 40-65 nm and inter-particle separation of 20 nm were fabricated by electron beam lithography. The aim of the present work is to investigate the effect of cuboid size on surface enhanced Raman scattering intensity and, thereby, to optimize the size of nanostructures in order to maximize signal enhancement. The electric field distribution of 4 x 4 array of Au cuboid nanostructures was numerically simulated by commercial software. A monolayer of Rhodamine-6G is deposited on the device using chemisorption technique, finding an enhancement factor similar to 10(4), which candidates the cuboid nanostnictures as a promising enhanced Raman substrate. (C) 2012 Elsevier B.V. All rights reserved.