Subdiffraction Limited, Remote Excitation of Surface Enhanced Raman Scattering
- 3 February 2009
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 9 (3), 995-1001
- https://doi.org/10.1021/nl8030696
Abstract
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.This publication has 43 references indexed in Scilit:
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