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Beamed Raman: directional excitation and emission enhancement in a plasmonic crystal double resonance SERS substrate
Yizhuo Chu1, Wenqi Zhu, Dongxing Wang
1School of Engineering and Applied Sciences, Harvard University, 29 Oxford St. Cambridge, MA 02138, USA.
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.
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