Tip-Enhanced Raman Spectroscopy and Imaging: An Apical Illumination Geometry

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Abstract:

Results are presented illustrating the use of tip-enhanced Raman spectroscopy (TERS) and imaging in a top-illumination geometry. A radially polarized beam is used to generate an electric field component in the direction of beam propagation, normal to the surface, resulting in a 5× increased enhancement compared to a linearly polarized beam. This multiplicative enhancement facilitates a discrimination of the near-field signal from the far-field Raman background. The top illumination configuration facilitates the application of TERS for investigating molecules on a variety of surfaces, such as Au, glass, and Si. The near-field Raman spectra of Si(100), rhodamine B, brilliant cresyl blue, and single wall carbon nanotubes are presented. Sufficient enhancement is obtained to permit a sub-diffraction-limited resolution Raman imaging of the surface distribution of large bundles of carbon nanotubes of various diameters.

Keywords: IMAGING; MICROSCOPY; NEAR FIELD; RADIAL POLARIZATION; RAMAN SPECTROSCOPY; TERS; TIP-ENHANCED RAMAN SPECTROSCOPY; VIBRATIONAL SPECTROSCOPY

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/000370208786401635

Affiliations: 1: Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892 2: Surface and Microanalysis Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899

Publication date: November 1, 2008

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