Waveguide-Enhanced Surface Plasmons for Ultrasensitive SERS Detection
Waveguide-Enhanced Surface Plasmons for Ultrasensitive SERS Detection
复制标题
用于超灵敏 SERS 检测的波导增强表面等离子体激元
DOI：
10.1021/jz401512k
复制
发表时间：
2013-09-19
影响因子：
5.7
通讯作者：
Xu, Weiqing
中科院分区：
文献类型：
--
作者：
Gu, Yuejiao;Xu, Shuping;Xu, Weiqing
设计了一种基于波导增强表面等离子体的超灵敏表面增强拉曼散射（Sers）基底。利用光波导来集中和限制入射光的电磁（EM）能量，并且使用组装在波导表面上的Ag纳米颗粒通过SP共振来进一步增强EM场。在纳米颗粒的两侧入射电磁场的增强因子（EF）可达103，Sers的EF值有望达到108-1012。这种波导辅助隔离的纳米颗粒基底可以达到与间隙型Sers热点相当的Sers增强能力。此外，该Sers基底适用于大分子（生物大分子等）的Sers检测，其不能放置在传统的间隙型热点中。
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 103 on the two sides of nanoparticles, and a 108–1012 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 SERS substrate is applicable to the SERS detection of large molecules (biomacromolecules etc.), which cannot be placed in traditional gap-type hot spots.