Journal
SMALL
Volume 5, Issue 24, Pages 2876-2882Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.200901312
Keywords
nanolithography; nanoslits; plasmons; Raman spectroscopy; simulations
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Funding
- Fonds voor Wetenschappeliik Onderzoek (FWO) [0366.06]
- KULeuven Research Fund [GOA 2006/2]
- Federal Science Policy of Belgium [IAP-VI/27]
- Flemish government
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The focusing of plasmons to obtain a strong and localized electromagnetic field enhancement for surface-enhanced Raman scattering (SERS) is increasing the interest in using plasmonic devices as molecular sensors. In this Full Paper, the successful fabrication and demonstration of a solid-state plasmonic nanoslit-cavity device equipped with nanoantennas on a freestanding thin silicon membrane as a substrate for SERS is reported. Numerical calculations predict a strong and spatially localized enhancement of the optical field in the nanoslit (6 nm in width) upon irradiation. The predicted enhancement factor of SERS was 5.3 x 10(5), localized in an area of just 6 x 1.5 nm(2). Raman spectroscopy and imaging confirm an enhancement factor of approximate to 10(6) for SERS from molecules chemisorbed at the nanoslit, and demonstrate the electromagnetic-field-enhancing function of the plasmonic nanoantennas. The freestanding membrane is open on both sides of the nanoslit, offering the potential for through-slit molecular translocation studies, and opening bright new perspectives for SERS applications in real-time (bio)chemical analysis.
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