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Title: Focusing Plasmons in Nanoslits for Surface-Enhanced Raman Scattering
Authors: Chen, Chang ×
Hutchison, James Andell
Van Dorpe, Pol
Kox, Ronald
De Vlaminck, Iwijn
Uji-I, Hiroshi
Hofkens, Johan
Lagae, Liesbet
Maes, Guido
Borghs, Gustaaf #
Issue Date: Dec-2009
Publisher: Wiley-v c h verlag gmbh
Series Title: Small vol:5 issue:24 pages:2876-2882
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 (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.
ISSN: 1613-6810
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular Imaging and Photonics
Semiconductor Physics Section
Associated Section of ESAT - INSYS, Integrated Systems
Solid State Physics and Magnetism Section
× corresponding author
# (joint) last author

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