title: Surface-enhanced Raman scattering from silver-coated opals.
abstract: We describe surface-enhanced Raman scattering measurements from a benzenethiol monolayer adsorbed on a silver-coated film that is, in turn, deposited on an artificial opal, where the latter is a close-packed three-dimensional dielectric lattice formed from polystyrene spheres. Data for a range of sphere sizes, silver film thicknesses, and laser excitation wavelengths are obtained. Enhancement factors can be in the range of 10(7). To partially explain these large enhancements, we have performed model finite-difference time domain simulations of the position-dependent electric fields generated at the opal surfaces for several experimentally studied laser wavelengths and sphere diameters.
authors: Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA. w-mu@northwestern.edu
authors: Weiqiang
authors: W
authors: Mu
authors: Dae-Kue
authors: DK
authors: Hwang
authors: Robert P H
authors: RP
authors: Chang
authors: Maxim
authors: M
authors: Sukharev
authors: Daniel B
authors: DB
authors: Tice
authors: John B
authors: JB
authors: Ketterson
mesh_terms: D000327:Adsorption; D010636:Phenols / Q000737:chemistry; D011137:Polystyrenes / Q000737:chemistry; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D013438:Sulfhydryl Compounds / Q000737:chemistry
chemical_list: D010636:Phenols; D011137:Polystyrenes; D013438:Sulfhydryl Compounds; D012834:Silver; C042983:thiophenol