Plasmonic nanorod arrays of a two-segment dimer and a coaxial cable with 1 nm gap for large field confinement and enhancement

被引:22
作者
Cheng, Zi-Qiang [1 ,2 ]
Nan, Fan [1 ,2 ]
Yang, Da-Jie [1 ,2 ]
Zhong, Yu-Ting [1 ,2 ]
Ma, Liang [1 ,2 ]
Hao, Zhong-Hua [1 ,2 ]
Zhou, Li [1 ,2 ]
Wang, Qu-Quan [1 ,2 ,3 ]
机构
[1] Wuhan Univ, Minist Educ, Key Lab Artificial Micro & Nanostruct, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China
[3] Wuhan Univ, Inst Adv Study, Wuhan 430072, Peoples R China
关键词
MOLECULE RAMAN-SPECTROSCOPY; OPTICAL-PROPERTIES; CORE-SHELL; NANOPARTICLE PROBES; GOLD NANOPARTICLES; SILVER NANOCUBES; HOT-SPOTS; SURFACE; SCATTERING; SERS;
D O I
10.1039/c4nr05544f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Seeking plasmonic nanostructures with large field confinement and enhancement is significant for photonic and electronic nanodevices with high sensitivity, reproducibility, and tunability. Here, we report the synthesis of plasmonic arrays composed of two-segment dimer nanorods and coaxial cable nanorods with similar to 1 nm gap insulated by a self-assembled Raman molecule monolayer. The gap-induced plasmon coupling generates an intense field in the gap region of the dimer junction and the cable interlayer. As a result, the longitudinal plasmon resonance of nanorod arrays with high tunability is obviously enhanced. Most interestingly, the field enhancement of dimer nanorod arrays can be tuned by the length ratio L-1/L-2 of the two segments, and the maximal enhancement appears at L-1/L-2 = 1. In that case, the two-photon luminescence (TPL) of dimer nanorod arrays and the Raman intensity in the dimer junction is enhanced by 27 and 30 times, respectively, under resonant excitation. In the same way, the Raman intensity in the gap region is enhanced 16 times for the coaxial cable nanorod arrays. The plasmonic nanorod arrays synthesized by the facile method, having tunable plasmon properties and large field enhancement, indicate an attractive pathway to the photonic nanodevices.
引用
收藏
页码:1463 / 1470
页数:8
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