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 107. 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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Mar 28, 2011
- Source ID
- 10.1063/1.3570827
Entities
People
- Dae-kue Hwang
- Daniel B. Tice
- J. B. Ketterson
- Maxim Sukharev
- Robert. P. H. Chang
- Weiqiang Mu
Organizations
- Arizona State University
- Daegu Gyeongbuk Institute of Science and Technology
- Defense Advanced Research Projects Agency
- National Science Foundation
- Northwestern University