Journal article
Focusing plasmons in nanoslits for surface-enhanced raman scattering
C Chen, JA Hutchison, P Van Dorpe, R Kox, I De Vlaminck, H Uji-I, J Hofkens, L Lagae, G Maes, G Borghs
Small | WILEY-V C H VERLAG GMBH | Published : 2009
Abstract
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 (6nm in width) upon irradiation. The predicted enhancement factor of SERS was 5.3 × 105, localized in an area of just 6 × 1.5 nm2. Raman spectroscopy and i..
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Awarded by Fonds voor Wetenschappeliik Onderzoek (FWO)
Awarded by KULeuven Research Fund
Awarded by Federal Science Policy of Belgium
Funding Acknowledgements
The authors thank Hugo Bender for performing the FIB preparation and measurements and Pascal Bertin, Niels Verellen, Dr. Kai Cheng, and Dr. Clemente Francesca for useful suggestions and comments. The authors also acknowledge the "Fonds voor Wetenschappeliik Onderzoek (FWO)" (Grant. 0366.06), the KULeuven Research Fund (Concerted Research Action GOA 2006/2, Center of Excellence CECAT, CREA2007), and the Federal Science Policy of Belgium (IAP-VI/27). Financial support from the long-term structural funding "Methusalem" program by the Flemish government is also gratefully acknowledged.