Large-area topography analysis and near-field Raman spectroscopy using bent fibre probes |
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| Authors: | J Prikulis K V G K Murty H Olin† & M Käll |
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| Affiliation: | Departments of Applied Physics and;Experimental Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden |
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| 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. |
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| Keywords: | Colloidal silver nanoparticles near-field optics surface-enhanced Raman spectroscopy |
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