Journal
OPTICS EXPRESS
Volume 19, Issue 21, Pages 20054-20068Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.020054
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Funding
- Defense Advanced Research Projects Agency (DARPA) issued by the Air Force Office of Scientific Research [FA9550-08-1-0285]
- DARPA issued by the Space and Naval Warfare Systems Center Pacific (SPAWAR) [N66001-10-1-4008]
- National Science Foundation [ECCS-0747560]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0747560] Funding Source: National Science Foundation
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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. (C) 2011 Optical Society of America
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