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

来源：

SMALL | 2009年 / 5卷 / 24期

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.

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收藏

页码：2876 / 2882

页数：7

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