Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences, Box 603-146, 100190 Beijing, China.
Nano Lett. 2009 Dec;9(12):4383-6. doi: 10.1021/nl902651e.
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.
细金属纳米线是光子学和电子学设备中等离子体导波的极具前途的候选材料。我们已经观察到，在金属纳米线的另一端激发等离子体后，来自纳米线末端的光以名义上 45-60 度的角度从纳米线轴发射出一个圆锥体，几乎没有光沿着纳米线的方向发射。这种令人惊讶的特性可以用简单的图来解释，即纳米线上向前和向后传播的等离子体的 Fabry-Perot 共振。这种强烈的角度依赖性发射是在设计基于耦合纳米线的光子器件和系统时必须考虑的关键特性。
