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Imaging of single GaN nanowires by tip‐enhanced Raman spectroscopy
Author(s) -
Marquestaut N.,
Talaga D.,
Servant L.,
Yang P.,
Pauzauskie P.,
LagugnéLabarthet F.
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.2404
Subject(s) - raman spectroscopy , raman microscope , raman scattering , spectrometer , nanowire , confocal , materials science , microscope , coherent anti stokes raman spectroscopy , optics , excitation , microscopy , wavelength , resolution (logic) , optoelectronics , physics , quantum mechanics , artificial intelligence , computer science
Raman imaging of a single [1 1 0] GaN nanowire using a combination of an atomic force microscope (AFM) and an inverted confocal microscope was investigated. The Raman spectra and associated maps of this single object, the diameter of which was of 200 nm, were collected in both confocal mode and with the interaction of an AFM tip to benefit from local tip enhancement effect. Beyond the pure tip‐enhanced Raman scattering (TERS) effect, the setup was developed to integrate a commercial AFM and spectrometer to permit simultaneous topography and vibrational imaging with spatial and spectral resolutions determined by the respective instruments. Data exchange and communication of the Raman spectrometer and the AFM were optimized to display both height and Raman intensity for a set of Z positions at the AFM tip for each ( x,y ) position on the sample. The experiments were conducted with both a straight tip coated with gold at an excitation of λ = 647 nm and with a tilted tip coated with silver at an excitation wavelength of λ = 514 nm. The TERS signal was observed for a given phonon mode of the [1 1 0] nanowire, providing an optical resolution that corresponds to the size of the object. Copyright © 2009 John Wiley & Sons, Ltd.