Abstract
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.
- Received 29 July 2010
- Publisher error corrected 14 December 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.246806
© 2010 The American Physical Society
Corrections
14 December 2010