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Optical properties of hexagonally arranged triangular arrays of Au-Ag nanoparticles

JIACHUN ZHENG1, JING LIU1,2,3,* , XIAOYI CHEN4, HAOYUAN CAI1, LINGQI KONG2,3

Affiliation

  1. School of Information Engineering, Jimei University, Xiamen, Fujian 361021, PR China
  2. Department of Physics, Xiamen University, Xiamen, Fujian 361005, PR China
  3. China Australia Joint Laboratory for Functional Nanomaterials, Xiamen University, Xiamen, Fujian 361005, PR China
  4. Department of Physics, National University of Singapore, Singapore 11 7551, Singapore

Abstract

Optical properties of hexagonally arranged triangular arrays of Au Ag nanoparticles are systematically investigated A gold thin film is deposited on top of the silver nanoparticles supported with substrate. The hybrid nanoparticles can prevent pure silver nanoparticles from oxidation and the stability of the hybrid Au Ag nanoparticles compared with pure silver nanoparticles has been verified. Influence of the particle thickness on the extinction spectrum is studied and optimized through discrete dipole approximation (DDA) method and nanosphere lithography (Considering the nano-fabrication condition, 40 nm thickness is selected and the array is fabricated. The experimental results demonstrate that the measured spectrums are basically in agreement with the theoretical spectrums derived by the DDA calculation..

Keywords

DDA NSL, Thickness, Au-Ag nanoparticle.

Citation

JIACHUN ZHENG, JING LIU, XIAOYI CHEN, HAOYUAN CAI, LINGQI KONG, Optical properties of hexagonally arranged triangular arrays of Au-Ag nanoparticles, Optoelectronics and Advanced Materials - Rapid Communications, 9, 5-6, May-June 2015, pp.630-635 (2015).

Submitted at: March 19, 2015

Accepted at: May 7, 2015