Super-Resolution Chemical Imaging with Plasmonic Substrates
Aeli P. Olson
Christopher
T. Ertsgaard
Sarah N. Elliott
Nathan C. Lindquist
10.1021/acsphotonics.5b00647.s002
https://acs.figshare.com/articles/media/Super_Resolution_Chemical_Imaging_with_Plasmonic_Substrates/2579275
We demonstrate super-resolution chemical
imaging with plasmonic
nanoholes via surface-enhanced Raman spectroscopy (SERS). Due to large
field enhancements, blinking behavior of SERS hot spots was observed
and processed using a stochastic optical reconstruction microscopy
(STORM) algorithm. This enabled localization to within 10 nm and high-resolution
imaging. However, illumination of the sample with a static laser beam
produced only SERS hot spots in fixed locations, leaving noticeable
gaps in the final images. By randomly altering the phase profile of
the incident beam with a simple optical diffuser, the hot spots were
shifted across the plasmonic surface to illuminate different areas
of the sample, thereby rendering a final image without the gaps. A
tunable band-pass filter was used to preserve spectral information,
allowing chemical contrast imaging. Images were then compared to those
obtained with a scanning electron microscope. Finally, we show that
super-resolution SERS images can also be obtained with our dynamic
illumination technique on even the most basic plasmonic substrate:
as-deposited rough silver films. These results show significant potential
for the use of simple plasmonic substrates with straightforward illumination
and collection schemes for super-resolution chemical imaging.
2016-02-17 00:00:00
plasmonic substrates
image
plasmonic substrate
plasmonic nanoholes
SERS
sample
field enhancements
laser beam
incident beam
Plasmonic Substrates
10 nm
gap
phase profile
scanning electron microscope
collection schemes
reconstruction microscopy
silver films
results show
illumination technique
plasmonic surface
chemical contrast imaging