title: Enhanced radiative emission rate and quantum efficiency in coupled silicon nanocrystal-nanostructured gold emitters.
abstract: 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.
authors.affiliation: California Institute of Technology, 1200 East California Boulevard, Pasadena, California 91125, USA. jsbiteen@caltech.edu
authors.forename: Julie S
authors.initials: JS
authors.lastname: Biteen
authors.forename: Domenico
authors.initials: D
authors.lastname: Pacifici
authors.forename: Nathan S
authors.initials: NS
authors.lastname: Lewis
authors.forename: Harry A
authors.initials: HA
authors.lastname: Atwater