Waveguide-Enhanced Surface Plasmons for Ultrasensitive SERS Detection

被引：44

作者：

Gu, Yuejiao ^{[1
]}

Xu, Shuping ^{[1
]}

Li, Haibo ^{[1
]}

Wang, Shaoyan ^{[1
]}

Cong, Ming ^{[1
]}

Lombardi, John R. ^{[2
]}

Xu, Weiqing ^{[1
]}

机构：

[1] Jilin Univ, State Key Lab Supramol Struct & Mat, Changchun 130012, Peoples R China

[2] CUNY City Coll, Dept Chem, New York, NY 10031 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2013年 / 4卷 / 18期

基金：

中国国家自然科学基金;

关键词：

RAMAN-SCATTERING; SINGLE-MOLECULE; HOT-SPOTS; SPECTROSCOPY;

D O I：

10.1021/jz401512k

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We design an ultrasensitive surface-enhanced Raman scattering (SERS) substrate based on waveguide-enhanced surface plasmons (SPs). An optical waveguide was exploited to concentrate and restrict the electromagnetic (EM) energy of the incident light, and Ag nanoparticles that were assembled on the waveguide surface were used to enhance the EM field further by means of SP resonance. The enhancement factor (EF) of the incident EM field can reach 10(3) on the two sides of nanoparticles, and a 10(8)-10(12) EF of SERS is expected. This waveguide-assisted isolated nanoparticle substrate can reach a comparable SERS enhancement capability to that of gap-type SERS hot spots. In addition, this SEAS substrate is applicable to the SERS detection of large molecules (biomacromolecules etc.), which cannot be placed in traditional gap-type hot spots.

引用

页码：3153 / 3157

页数：5

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