Plasmonic Coupling Effect in Ag Nanocap-Nanohole Pairs for Surface-Enhanced Raman Scattering

被引：24

作者：

Wen, Xiaolei ^{[1
]}

Xi, Zheng ^{[1
]}

Jiao, Xiaojin ^{[2
]}

Yu, Wenhai ^{[1
]}

Xue, Guosheng ^{[3
]}

Zhang, Douguo ^{[1
]}

Lu, Yonghua ^{[1
]}

Wang, Pei ^{[1
]}

Blair, Steve ^{[2
]}

Ming, Hai ^{[1
]}

机构：

[1] Univ Sci & Technol China, Dept Opt & Opt Engn, Anhui Key Lab Optoelect Sci & Technol, Hefei 230026, Anhui, Peoples R China

[2] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA

[3] Univ Sci & Technol China, Dept Opt & Opt Engn, Biolaser Lab, Hefei 230026, Anhui, Peoples R China

来源：

PLASMONICS | 2013年 / 8卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Plasmonic interaction; Surface-enhanced Raman scattering (SERS); Hot spot; Nanoscale gap; SPECTROSCOPY; MOLECULES;

D O I：

10.1007/s11468-012-9379-8

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 plasmonic coupling structure composed of Ag nanocap-nanohole pairs was fabricated through a novel and facile method. Both surface-enhanced Raman scattering (SERS) measurements and numerical simulations show that the cap-hole system produces much larger electric field enhancement and SERS signal than the isolated structures, which is due to the plasmonic coupling effect between the gap of the cap and the hole. Additionally, the plasmonic enhancement is sensitive to the gap size, which can be controlled by the Ag layer thickness during the evaporation process. A maximum enhancement factor of 1.1 x 10(8) can be obtained with optimized gap size.

引用

页码：225 / 231

页数：7

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