Nanoscale Chemical Imaging Using Top-Illumination Tip-Enhanced Raman Spectroscopy

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Author(s) Stadler, Johannes, Schmid, Thomas W., Zenobi, Renato
Publication Type Journal Items, Publication Status: Published
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Title Nanoscale Chemical Imaging Using Top-Illumination Tip-Enhanced Raman Spectroscopy
Author(s) Stadler, Johannes
Schmid, Thomas W.
Zenobi, Renato
Journal or Series Title Nano letters
Volume Number 10
Issue Number 11
Start Page 4514
End Page 4520
ISSN 1530-6984
Publisher American Chemical Society
Publication Place Washington, D.C.
Publication Date 2010-11
Keyword(s) Tip-enhanced Raman spectroscopy (TERS)
Gap-mode TERS
Enhanced Raman
Spectroscopic imaging
Top illumination
Scanning tunneling microscopy
Nanoscale chemical imaging
Abstract We present a new top-illumination scheme for rip-enhanced Raman spectroscopy (TERS) in a gap-mode configuration with illumination and detection in a straightforward fashion perpendicular to the sample surface. This illumination focuses the light tightly around the tip end, which effectively diminishes far-field background contributions during TERS measurements. The setup maintains the entire functionality range of both the scanning probe microscopy and the confocal optical microscopy of the setup. For the first time, we show large (64 x 64 up to 200 x 200 pixels), high-resolution TEES imaging with full spectral information at every pixel, which is necessary for the chemical identification of sample constituents. With a scanning tunneling microscope tip and feedback, these TERS maps can be recorded with a resolution better than 15 nm (most likely even less, as discussed with Figure 6). An excellent enhancement (similar to 10(7) x, sufficient for detection of few molecules) allows short acquisition times (<< 1 s/pixel) and reasonably low laser power (in the microwatt regime) yielding spectroscopic images with high pixel numbers in reasonable time (128 x 128 pixels in <25 min). To the best Of our knowledge, no Raman maps with similar pixel numbers and full spectral information have ever been published.
DOI 10.1021/nl102423m
Additional Notes Received for review 12 July 2010, Published on web 18 October 2010
Document Type Article
Publication Status Published
Language English
Assigned Organisational Unit(s) 03430
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NEBIS System Number 004005223
Source Database ID WOS-000283907600037
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  author = "Stadler, Johannes and Schmid, Thomas W. and Zenobi, Renato",
  title = "{N}anoscale {C}hemical {I}maging {U}sing {T}op-{I}llumination {T}ip-{E}nhanced {R}aman {S}pectroscopy",
  journal = "Nano letters",
  year = 2010,
  volume = "10",
  number = "11",
  pages = "4514--4520",
  month = nov,

E-Citations record created: Mon, 06 Dec 2010, 10:12:50 CET