Localized surface plasmons, surface plasmon polaritons, and their coupling in 2D metallic array for SERS

被引：45
|
作者：
Du, Luping [1 ]
Zhang, Xuejin [1 ]
Mei, Ting [1 ,2 ]
Yuan, Xiaocong [3 ]
机构：
[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Photon Res Ctr, Singapore 639798, Singapore
[2] S China Normal Univ, Inst Optoelect Mat & Technol, Guangzhou 510631, Guangdong, Peoples R China
[3] Nankai Univ, Minist Educ China, Inst Modern Opt, Key Lab Optoelect Informat Sci & Technol, Tianjin 300071, Peoples R China
来源：
OPTICS EXPRESS | 2010年 / 18卷 / 03期
基金：
新加坡国家研究基金会; 中国国家自然科学基金;
关键词：
ENHANCED RAMAN-SCATTERING; RESONANCE SPECTROSCOPY; NANOPARTICLES;
D O I：
10.1364/OE.18.001959
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A substrate with ease for fabrication is proposed for surface enhanced Raman spectroscopy (SERS). A two-dimensional dielectric grating covered by a thin silver film enables the excitation of both localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs). The finite-difference time-domain simulation results show that the coupling between LSPs and SPPs is able to highly improve the Raman enhancement (2 x 10(9) as obtained by simulation). In addition, the near-field distribution at the top of cubic bumps along the transverse plane presents a highly regular hotspots pattern, which is required for an ideal SERS substrate. (C) 2009 Optical Society of America
引用
收藏
页码：1959 / 1965
页数：7
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