"

Cookies ussage consent

I agree.

Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.

Effect of gold layer thickness on optical properties and sensing performance of triangular silver nanostructure array

JING LIU1,2,3,* , 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

Abstract

Optical performance of the nanophotonic devices with pure silver nanostructure will be changed due to the oxidation and sulfuration. A hybrid Au-Ag triangular nanostructure is put forth for the purpose of preventing oxidation and sulfuration of Ag film. Effect of gold layer thickness on optical properties and sensing performance of the hybrid nanostructure array is systematically investigated through numerical simulation using the discrete dipole approximation (DDA) method. Theoretical results show that the oxide layer and sulfide layer leads to a significant red shift in the localized surface plasmon resonance (LSPR) λmax. The refractive index sensitivity (RIS) and figure of merit (FOM) of the hybrid nanostructure array strongly depend on thickness of the Au layer. It is found to possess the better RIS and FOM, when thickness of Au is 10 nm, thickness of Ag is 25 nm. Moreover, the hybrid nanostructure with the suitable Au layer thickness is fabricated by nanosphere lithography (NSL). The experimental results demonstrate that the measured spectrum is basically in agreement with the theoretical spectrum derived by the DDA calculation..

Keywords

DDA; NSL, The hybrid Au-Ag nanoparticles, LSPR, RIS, FOM.

Citation

JING LIU, HAOYUAN CAI, LINGQI KONG, Effect of gold layer thickness on optical properties and sensing performance of triangular silver nanostructure array, Optoelectronics and Advanced Materials - Rapid Communications, 8, 11-12, November-December 2014, pp.1085-1090 (2014).

Submitted at: May 3, 2014

Accepted at: Nov. 13, 2014