Silver Nanowires Terminated by Metallic Nanoparticles as Effective Plasmonic Antennas

被引:17
|
作者
Kenens, Bart [1 ]
Rybachuk, Maksym [1 ]
Hofkens, Johan [1 ]
Uji-i, Hiroshi [1 ,2 ]
机构
[1] Katholieke Univ Leuven, Dept Chem, B-3001 Heverlee, Belgium
[2] Japan Sci & Technol Agcy JST, PRESTO, Kawaguchi, Saitama 3320012, Japan
来源
JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 06期
基金
欧洲研究理事会; 日本科学技术振兴机构; 比利时弗兰德研究基金会;
关键词
ELECTROMAGNETIC ENERGY-TRANSPORT; SURFACE-ENHANCED RAMAN; DIFFRACTION LIMIT; POLYOL SYNTHESIS; PROPAGATION; MODES; LIGHT; POLARITON;
D O I
10.1021/jp308683b
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
Metallic nanowires constitute a distinctive class of nanostructures that are able to guide surface plasmons in subwavelength dimensions. The effective use of light in-and out-coupling in low dimensional systems, such as excitation of surface plasmon polaritons along metallic nanowires, has been proposed to reduce physical dimensions of opto-electronic and nano-optical components and for high-resolution microscopy applications. Our investigation of light in-and out-coupling on silver nanowire systems by scanning optical coupling microscopy (SOCM) performed in combination with atomic force microscopy (AFM) revealed that the maximum coupling was obtained when the exciting laser light is projected at the end of the nanowire with a positioning accuracy of approximately 100 nm. Furthermore, it was found that a nanoparticle positioned at the end of a nanowire imparts an enhanced (by almost the factor of 4) plasmon in-and out-coupling light efficiency as compared to a free nanowire under the same excitation conditions. These findings are supported by theoretical simulations, which in addition provide a correlation between the nanoparticle size and the out-coupling light efficiency. Our investigations demonstrate that a combination of SOCM and AFM methods provide reliable qualitative and quantitative evaluation of plasmon in-and out-coupling characteristics on metallic nanowire systems.
引用
收藏
页码:2547 / 2553
页数:7
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