Double-Layered Metal Nano-Strip Antennas for Sensing Applications

被引：13
|
作者：
Kang, Zhiwen [1 ]
Zhang, Haixi [1 ]
Lu, Haifei [1 ]
Ho, Ho-Pui [1 ]
机构：
[1] Chinese Univ Hong Kong, Ctr Adv Res Photon, Dept Elect Engn, Shatin, Hong Kong, Peoples R China
来源：
PLASMONICS | 2013年 / 8卷 / 02期
关键词：
Metal nano-strips; Refractive index sensitivity; SERS; Optical trapping; ENHANCED RAMAN-SCATTERING; SERS;
D O I：
10.1007/s11468-012-9388-7
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：
A coupled plasmonic system based on double-layered metal nano-strips for sensing applications is investigated by means of mode analysis and two-dimensional finite-difference time-domain simulations. The nano-strips act as optical antennas through constructive interference of short-range surface plasmon polaritons, thus increasing their scattering cross-section and optical field enhancement. Near-field modulation by optical trapped metal nanoparticles (NPs) is also demonstrated. Our results reveal that the device exhibits a refractive index sensitivity of similar to 200 nm/RIU, and a maximum surface-enhanced Raman scattering (SERS) factor of 10(9)-10(10) from metal NPs trapped in the near-field region. The proposed device shows reasonable figure-of-merit and is ready for integration with common optofluidic biosensors.
引用
收藏
页码：289 / 294
页数：6
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