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Tip-enhanced Raman imaging and spectroscopy: sensitivity, symmetry and selection rules

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: C. C. Neacsu and S. Berweger and M. B. Raschke

Editorial: J. Nanobiotechnology, in press, 2008.

Rezumat:

The fundamental mechanisms of tip-enhanced Raman spectroscopy (TERS) have been investigated, including
the role of the plasmonic excitation of the metallic tips, the nature of the optical tip-sample coupling, and
the resulting local-field enhancement and confinement responsible for ultrahigh resolution imaging down to just
several nanometers. Criteria for the distinction of near-field signature from far-field imaging artifacts are addressed.
TERS results of molecules are presented. With enhancement factors as high as 109, single molecule
spectroscopy is demonstrated. Spatially resolved vibrational mapping of crystalline nanostructures and determination
of crystallographic orientation and domains is discussed making use of the symmetry properties of the
tip scattering response and the intrinsic Raman selection rules.

Cuvinte cheie: TERS, single molecule, Raman, selection rules, symmetry