Cascaded Optical Field Enhancement in Composite Plasmonic Nanostructures
Burrows, Christopher P.
Barnes, William L.
Physical Review Letters
American Physical Society
We present composite plasmonic nanostructures designed to achieve cascaded enhancement of electromagnetic fields at optical frequencies. Our structures were made with the help of electron-beam lithography and comprise a set of metallic nanodisks placed one above another. The optical properties of reproducible arrays of these structures were studied by using scanning confocal Raman spectroscopy. We show that our composite nanostructures robustly demonstrate dramatic enhancement of the Raman signals when compared to those measured from constituent elements.
Copyright © 2010 The American Physical Society
Vol. 105 (24), article 246806