Directional Light Emission from Propagating Surface Plasmons of Silver Nanowires
Directional Light Emission from Propagating Surface Plasmons of Silver Nanowires
复制标题
银纳米线传播表面等离子体的定向光发射
DOI：
10.1021/nl902651e
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发表时间：
2009-12-01
期刊：
影响因子：
10.8
通讯作者：
Xu, Hongxing
中科院分区：
文献类型：
--
作者：
Li, Zhipeng;Hao, Feng;Xu, Hongxing
薄金属纳米线是非常有前途的候选人，在光子和电子器件的等离子体波导。我们已经观察到，来自银纳米线的端部的光，在线的另一端处的等离子体激元的激发之后，在与纳米线轴成标称45-60度的角的圆锥体中发射，几乎没有光沿着纳米线的方向沿着发射。这个令人惊讶的特性可以用一个简单的图片来解释，这个图片调用了纳米线上向前和向后传播的等离子体的法布里-珀罗共振。这种强烈的角度依赖性发射是在设计基于耦合波导的光子器件和系统时必须考虑的关键特性。
Thin metallic nanowires are highly promising candidates for plasmonic waveguides in photonic and electronic devices. We have observed that light from the end of a silver nanowire, following excitation of plasmons at the other end of the wire, is emitted in a cone of angles peaking at nominally 45-60 degrees from the nanowire axis, with virtually no light emitted along the direction of the nanowire. This surprising characteristic can be explained in a simple picture invoking Fabry-Perot resonances of the forward- and back-propagating plasmons on the nanowire. This strongly angular-dependent emission is a critical property that must be considered when designing coupled nanowire-based photonic devices and systems.