Premium
Tip‐enhanced broadband CARS spectroscopy and imaging using a photonic crystal fiber based broadband light source
Author(s) -
Furusawa Kentaro,
Hayazawa Norihiko,
Catalan Francesca Celine,
Okamoto Takayuki,
Kawata Satoshi
Publication year - 2012
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.3151
Subject(s) - supercontinuum , broadband , materials science , raman spectroscopy , optics , photonic crystal fiber , spectroscopy , numerical aperture , optoelectronics , raman scattering , imaging spectroscopy , carbon nanotube , nanotechnology , physics , wavelength , quantum mechanics
We report tip‐enhanced broadband coherent anti‐Stokes Raman scattering (CARS) spectroscopy and imaging based on a broadband light source using a photonic crystal fiber. Multiplexing from 900 cm –1 to 2200 cm –1 is achieved by optimizing the supercontinuum generation process at a high numerical aperture focus. By combining this system with a shear‐force microscope, semiconducting carbon nanotubes are imaged with a spatial resolution of 60 nm. Our results show that tip‐enhanced broadband CARS image exhibits a positive contrast even though the enhancement effect has not been fully optimized. Analyses of delay‐dependent tip‐enhanced broadband CARS spectra suggest the possibilities of multiple carrier interactions that uniquely occur at high intensities within the nanotubes. Copyright © 2012 John Wiley & Sons, Ltd.