Enhanced radiative emission rate and quantum efficiency in coupled silicon nanocrystal-nanostructured gold emitters.
We report local-field-enhanced light emission from silicon nanocrystals close to a film of nanoporous gold. We resolve photoluminescence as the gold-Si nanocrystal separation distance is varied between 0 and 20 nm and observe a fourfold luminescence intensity enhancement concomitant with increases in the coupled silicon nanocrystal/nanoporous gold absorbance cross section and radiative decay rate. A detailed analysis of the luminescence data indicated a local-field-enhanced quantum efficiency of 58% for the Si nanocrystals coupled to the nanoporous gold layer.
Biteen
Julie S
JS
California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA. jsbiteen@caltech.edu
Pacifici
Domenico
D
Lewis
Nathan S
NS
Atwater
Harry A
HA