Journal article
Beamed raman: Directional excitation and emission enhancement in a plasmonic crystal double resonance SERS substrate
Y Chu, W Zhu, D Wang, KB Crozier
Optics Express | OPTICAL SOC AMER | Published : 2011
DOI: 10.1364/OE.19.020054
Abstract
The angular dependencies of the local field enhancement and the Raman emission enhancement are investigated, numerically and experimentally, for a plasmonic crystal double resonance SERS substrate consisting of a periodic array of gold disks above a gold film. We find that the local field enhancement is very sensitive to the incident angle. The Raman emission enhancement has a strong angular dependence on the detection direction, with the substrate "beaming" the Raman emission so that different Raman lines have different far-field patterns. We demonstrate that a stronger SERS signal results when the plasmonic substrate is illuminated with a collimated, rather than focused, laser beam. © 2011..
View full abstractGrants
Awarded by Defense Advanced Research Projects Agency (DARPA) issued by the Air Force Office of Scientific Research
Awarded by DARPA issued by the Space and Naval Warfare Systems Center Pacific (SPAWAR)
Awarded by National Science Foundation
Awarded by Div Of Electrical, Commun & Cyber Sys; Directorate For Engineering
Funding Acknowledgements
The authors thank Kai Wang for making the mask for the SERS measurement. This work was supported by the Defense Advanced Research Projects Agency (DARPA) SERS S&T Fundamentals program under grant no. FA9550-08-1-0285 issued by the Air Force Office of Scientific Research, by the DARPA N/MEMS S&T Fundamentals program under grant no. N66001-10-1-4008 issued by the Space and Naval Warfare Systems Center Pacific (SPAWAR), and by the National Science Foundation under grant no. ECCS-0747560 (CAREER award). Fabrication work was carried out at the Harvard Center for Nanoscale Systems, which is supported by the National Science Foundation.