title: Large-area topography analysis and near-field Raman spectroscopy using bent fibre probes.
abstract: We present a method for combined far-field Raman imaging, topography analysis and near-field spectroscopy. Surface-enhanced Raman spectra of Rhodamine 6G (R6G) deposited on silver nanoparticles were recorded using a bent fibre aperture-type near-field scanning optical microscope (NSOM) operated in illumination mode. Special measures were taken to enable optical normal-force detection for control of the tip-sample distance. Comparisons between far-field Raman images of R6G-covered Ag particle aggregates with topographic images recorded using atomic force microscopy (AFM) indicate saturation effects due to resonance excitation.
authors.affiliation: Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. prikulis@fy.chalmers.se
authors.forename: J
authors.initials: J
authors.lastname: Prikulis
authors.forename: K V G K
authors.initials: KV
authors.lastname: Murty
authors.forename: H
authors.initials: H
authors.lastname: Olin
authors.forename: M
authors.initials: M
authors.lastname: Käll