Focusing Plasmons in Nanoslits for Surface-Enhanced Raman Scattering

被引:52
作者
Chen, Chang [1 ]
Hutchison, James Andell [2 ]
Van Dorpe, Pol [1 ]
Kox, Ronald [1 ]
De Vlaminck, Iwijn [1 ]
Uji-i, Hiroshi [2 ]
Hofkens, Johan [2 ]
Lagae, Liesbet [1 ]
Maes, Guido [2 ]
Borghs, Gustaaf [1 ]
机构
[1] IMEC VZW, B-3001 Louvain, Belgium
[2] Katholieke Univ Leuven, Dept Chem, B-3001 Louvain, Belgium
关键词
nanolithography; nanoslits; plasmons; Raman spectroscopy; simulations; SINGLE-MOLECULE; SERS; NANOPARTICLES; EXCITATION; SILVER;
D O I
10.1002/smll.200901312
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:2876 / 2882
页数:7
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