Silver nanowires have attracted considerable attention as subdiffraction limited diameter waveguides in a variety of applications including cell endoscopy and photonic integrated circuitry. Optical signal transport occurs by coupling light into propagating surface plasmons, which scatter back into light further along the wire. However, these interconversions only occur efficiently at wire ends, or at defects along the wire, which are not controlled during synthesis. Here, we overcome this limitation, demonstrating the visible laser light-induced fabrication of gold nanostructures at desired positions on silver nanowires, and their utility as efficient in/out coupling points for light. The gold nanostructures grow via plasmon-induced reduction of Au(III) and are shown to be excellent “hotspots” for surface-enhanced Raman scattering.

中文翻译：

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等离子体纳米线上光信号输入/输出位点的受控制造

在包括细胞内窥镜和光子集成电路在内的各种应用中，作为亚衍射极限直径的波导，银纳米线已引起了相当大的关注。光信号传输是通过将光耦合到传播的表面等离子体激元发生的，该等离子体激元沿着导线进一步散射回光。然而，这些互变仅在导线末端或沿着导线的缺陷处有效地发生，而这些在合成期间是不受控制的。在这里，我们克服了这一限制，展示了可见激光诱导的银纳米线上所需位置的金纳米结构的制造，以及它们作为光的有效输入/输出耦合点的效用。金纳米结构是通过等离激元诱导的Au（III）还原而生长的，并被证明是表面增强拉曼散射的极好“热点”。