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Near-field Raman and Absorption Spectroscopy

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Abstract

Optical spectroscopy provides a wealth of information on structural and dynamical properties of materials. The chemical specificity attained through optical spectroscopy (IR absorption, Ra-man scattering, etc.) is remarkable. We will demonstrate that near-field optics makes it possible to extend resolution of optical spectroscopy down to 10nm, - the length scale of biological proteins and the length scale of quantum confinement in semiconductor nanostructures. Our approach makes use of the highly localized electromagnetic field at a laser-irradiated metal tip. This lo-calized field acts as a secondary light source that can be raster-scanned over a sample surface at close proximity. For every sample pixel, an entire Raman scattering spectrum is recorded and evaluated. We have applied this type of near-field Raman microscopy to the characterization of single-walled carbon nanotubes (SWNTs). The technique is able to localize defects and dopants. The technique holds also promise for the nanoscale analysis of local stress in silicon nanostructures.

© 2005 Optical Society of America

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