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Polar phonon mode selection rules in tip‐enhanced Raman scattering
Author(s) -
Berweger Samuel,
Raschke Markus B.
Publication year - 2009
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2407
Subject(s) - raman scattering , phonon , raman spectroscopy , x ray raman scattering , coherent anti stokes raman spectroscopy , condensed matter physics , polarization (electrochemistry) , scattering , polar , optics , chemistry , molecular physics , materials science , physics , quantum mechanics
Abstract We discuss the use of the symmetry selectivity of phonon Raman scattering to determine nanocrystallographic information of solids using tip‐enhanced Raman scattering (TERS). The necessary degrees of freedom arise from the combination of the Raman selection rules reflecting crystal symmetry superimposed by the polarization and k ‐vector‐dependent field enhancement and scattering of the scanning probe tip. The resulting phonon TERS selection rules are discussed, including the use of the crystal Raman tensor and momentum conservation for polar phonon modes. We demonstrate the selection rules for both far‐field and tip‐enhanced near‐field Raman scattering from bulk and nanocrystalline LiNbO 3 . Copyright © 2009 John Wiley & Sons, Ltd.