A nanotweezer system for evanescent wave excited surface enhanced Raman spectroscopy (SERS) of single nanoparticles
Optics Express, ISSN: 1094-4087, Vol: 23, Issue: 5, Page: 6793-6802
2015
- 36Citations
- 39Captures
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Metrics Details
- Citations36
- Citation Indexes36
- 36
- CrossRef34
- Captures39
- Readers39
- 39
Article Description
We experimentally demonstrate the integration of near-field optical tweezers with surface enhanced Raman scattering (SERS) spectroscopy by using the optical evanescent wave from a silicon nitride waveguide to trap single shell-isolated metallic nanoparticles (NPs) and simultaneously excite SERS signals of Raman reporter molecules adsorbed on the surface of the trapped metallic NPs. Both evanescent wave excited Stokes and anti-Stokes SERS spectra of waveguide trapped single silver (Ag) NPs were acquired, which were compared to their far-field SERS spectra. We investigated the trapping of bare and shell-isolated metallic NPs and determined that the addition of a shell to the metallic NPs minimized particle-induced laser damage to the waveguide, which allowed for the stable acquisition of the SERS spectra. This work realizes a new nanophotonic approach, which we refer to as near-field light scattering Raman (NLS-Raman), for simultaneous near-field optical trapping and SERS characterization of single metallic NPs.
Bibliographic Details
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84964569242&origin=inward; http://dx.doi.org/10.1364/oe.23.006793; http://www.ncbi.nlm.nih.gov/pubmed/25836898; https://www.osapublishing.org/abstract.cfm?URI=oe-23-5-6793; https://www.osapublishing.org/viewmedia.cfm?URI=oe-23-5-6793&seq=0; https://opg.optica.org/abstract.cfm?URI=oe-23-5-6793; https://dx.doi.org/10.1364/oe.23.006793; https://opg.optica.org/oe/fulltext.cfm?uri=oe-23-5-6793&id=312650
The Optical Society
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