Controlled Fabrication of Optical Signal Input/Output Sites on Plasmonic Nanowires
Controlled Fabrication of Optical Signal Input/Output Sites on Plasmonic Nanowires
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DOI：
10.1021/acs.nanolett.9b05199
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发表时间：
2020-04-08
期刊：
影响因子：
10.8
通讯作者：
Uji-i, Hiroshi
中科院分区：
文献类型：
--
作者：
Toyouchi, Shuichi;Wolf, Mathias;Uji-i, Hiroshi
银纳米线作为亚衍射极限直径波导在包括细胞内窥镜检查和光子集成电路的各种应用中引起了相当大的关注。光信号传输通过将光耦合到传播的表面等离子体中而发生，表面等离子体进一步沿导线沿着散射回光。然而，这些相互转换仅有效地发生在导线末端，或沿着导线的缺陷处，这在合成期间不受控制。在这里，我们克服了这一限制，展示了可见激光诱导的制造的金纳米结构在所需的位置上的银纳米线，和它们的效用作为有效的输入/输出耦合点的光。金纳米结构生长通过等离子体诱导的还原Au（III），并被证明是优秀的“热点”的表面增强拉曼散射。
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.