Journal
NANO LETTERS
Volume 9, Issue 3, Pages 995-1001Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl8030696
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Funding
- Fonds voor Wetenschappelijk Onderzoek (FWO) [G.0366.06]
- KULeuven Research Fund [GOA 2006/2]
- Center of Exellence CECAT
- Federal Science Policy of Belgium [IAP-VI/27]
- EC sixth Framework Program [ERAS-CT-2003-980409]
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We demonstrate that focused laser excitation at the end of silver nanowires of 50-150 nm diameter excites SERS hot-spots at points of nanoparticle adsorption many micrometers along the wire due to the plasmon waveguide effect. The total SERS Intensity detected at the hot-spots following wire-end excitation correlates with the known wavelength, polarization, and distance dependences of surface plasmon polariton (SPP) propagation in nanowires. The SERS spectra obtained at the hot-spots following wire-end excitation show very little background compared to when excitation occurs directly at the hot-spot, suggesting that a much smaller SERS excitation volume Is achieved by remote, waveguide excitation. The ability to transfer SERS excitation over several micrometers, through a structure with a subdiffraction limit diameter, Is discussed with respect to potential high-resolution SERS imaging applications.
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