Direct Observation of
Beamed Raman Scattering
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Abstract
Appropriately designed surface plasmon nanostructures
enable the
emission patterns of surface-enhanced Raman scattering to be modified
to facilitate efficient collection, an effect sometimes termed “beamed
Raman scattering”. Here, we demonstrate the direct and unambiguous
observation of this phenomenon by separating the Raman emission pattern
from the luminescent background using energy momentum spectroscopy.
We observe beamed Raman scattering from two types of optical antennas:
the first are Yagi–Uda optical antennas, and the second are
optical dimer antennas formed above a plasmonic substrate consisting
of a gold film integrated with a one-dimensional array of gold stripes.
For both antenna types, the emission patterns from different Raman
lines are simultaneously measured. For the second antenna type, the
emission patterns show signatures stemming from the bandstructure
of the plasmonic substrate