Resonant excitation of tip plasmons for tip-enhanced Raman SNOM

Ultramicroscopy
F FestyD Richards

Abstract

The conditions necessary for the optimisation of tip-enhanced scanning near-field optical microscopy have been determined. The Raman scattering efficiency can be enormously increased by enhancements in the local field amplitude, such as that which can occur in the vicinity of a metallic nanostructure. The field enhancement in the vicinity of a silver tip is investigated theoretically here using the finite difference time domain method. Field enhancements from electron oscillations on the tip are shown to display strong maxima at resonant illumination wavelengths and the nature of these enhancements at the substrate surface beneath the tip, both on and off resonance, has been calculated. The enhancement of the Raman signal on the surface decreases exponentially as the tip-substrate separation is increased and a peak Raman enhancement of 10(7) is theoretically achievable at a tip-surface separation of 2 nm. The resolution is also strongly related to the distance between the tip and the substrate surface narrowing to <7 nm, significantly smaller than the radius of curvature of the end of the tip.

References

Apr 12, 2001·Journal of Microscopy·T KalkbrennerV Sandoghdar

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Citations

May 28, 2005·The Journal of Chemical Physics·A L DemmingD Richards
Apr 30, 2008·Chemical Society Reviews·Elena Bailo, Volker Deckert
Jul 2, 2015·Advanced Drug Delivery Reviews·Gaurav SharmaVolker Deckert
Jun 14, 2006·Microscopy Research and Technique·Alexandre Bouhelier
Mar 1, 2012·Journal of Biophotonics·Tanja Deckert-GaudigVolker Deckert
Nov 23, 2011·Nanoscale·Johannes StadlerRenato Zenobi
Jun 15, 2016·Analytical Chemistry·Natalia Martín SabanésKatrin F Domke
Aug 23, 2016·Journal of Biophotonics·Katarzyna BulatMalgorzata Baranska
Jul 14, 2016·Applied Spectroscopy·Valentin Sereda, Igor K Lednev
Feb 25, 2018·Optics Express·T H J LoughranR J Hicken
Apr 14, 2018·International Journal of Molecular Sciences·Lizhen GaoBo Liu
Oct 4, 2005·Physical Review Letters·Chaoyang JiangVladimir V Tsukruk
Apr 13, 2006·Nano Letters·Neil AndersonLukas Novotny
Apr 10, 2009·The Journal of Physical Chemistry. a·Maxim Sukharev, Tamar Seideman
Jul 19, 2017·Langmuir : the ACS Journal of Surfaces and Colloids·Jacob D Scherger, Mark D Foster
Jul 21, 2006·The Journal of Physical Chemistry. B·Ioan Notingher, Alistair Elfick

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