Gold Nanoparticles as Probes for Nano-Raman Spectroscopy: Preliminary Experimental Results and Modeling. (7th March 2012)

• Record Type: Journal Article
• Authors: Le Nader, V.; Mevellec, J.-Y.; Minea, T.; Louarn, G.
• Other Names: Passian Ali Academic Editor.
• Is Part Of: International journal of optics. Volume 2012(2012)
• Publication Date: 2012-03-07
• Subjects: Optics -- Periodicals; Optics; Periodicals; 535
• DOI: 10.1155/2012/591083
• Languages: English
• ISSNs: 1687-9392

Abstract

Abstract : This paper presents an effective Tip-Enhanced Raman Spectrometer (TERS) in backscattering reflection configuration. It combines a tip-probe nanopositioning system with Raman spectroscope. Specific tips were processed by anchoring gold nanoparticles on the apex of tapered optical fibers, prepared by an improved chemical etching method. Hence, it is possible to expose a very small area of the sample ( ~ 20 nm 2 ) to the very strong local electromagnetic field generated by the lightning rod effect. This experimental configuration was modelled and optimised using the finite element method, which takes into account electromagnetic effects as well as the plasmon resonance. Finally, TERS measurements on single-wall carbon nanotubes were successfully performed. These results confirm the high Raman scattering enhancement predicted by the modelling, induced by our new nano-Raman device.