Pressure-assisted melt-filling and optical characterization of Au nano-wires in microstructured fibers
Pressure-assisted melt-filling and optical characterization of Au nano-wires in microstructured fibers
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DOI：
10.1364/oe.19.012180
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发表时间：
2011-06-20
期刊：
影响因子：
3.8
通讯作者：
Russell, P. St. J.
中科院分区：
文献类型：
--
作者：
Lee, H. W.;Schmidt, M. A.;Russell, P. St. J.
我们报道了一种新的基于剪接的压力辅助熔融填充技术，用于在微结构二氧化硅光纤的中空通道中创建金属纳米线。当充填压力为300bar时，可获得直径为120 nm(典型纵横比为50：1)的丝材。作为一个例子，我们研究了一种传统的单模阶跃折射率光纤，其芯附近有一根平行的金纳米线(线直径510 nm)。光学透射谱显示，在纳米线上的表面等离子激元导模与玻璃芯模匹配的波长处出现下降。通过监测纳米线狭窄缝隙处的侧向散射光，可以估计损失。在共振时测得了低至0.7分贝/毫米的数值，相当于玻璃-芯/纳米线系统的超长程本征模的数值。通过热处理，空心通道可以可控地坍塌，从而可以产生圆锥形的金纳米线，其光学性质可以通过侧向散射进行监测。该技术的重复性和导线的高光学质量使其在非线性等离子激元、近场扫描光学显微镜尖端、柱面偏振器、光学传感和电信等领域得到了应用。(C)2011年美国光学学会
We report a novel splicing-based pressure-assisted melt-filling technique for creating metallic nanowires in hollow channels in microstructured silica fibers. Wires with diameters as small as 120 nm (typical aspect ration 50:1) could be realized at a filling pressure of 300 bar. As an example we investigate a conventional single-mode step-index fiber with a parallel gold nanowire (wire diameter 510 nm) running next to the core. Optical transmission spectra show dips at wavelengths where guided surface plasmon modes on the nanowire phase match to the glass core mode. By monitoring the side-scattered light at narrow breaks in the nanowire, the loss could be estimated. Values as low as 0.7 dB/mm were measured at resonance, corresponding to those of an ultra-long-range eigenmode of the glass-core/nanowire system. By thermal treatment the hollow channel could be collapsed controllably, permitting creation of a conical gold nanowire, the optical properties of which could be monitored by side-scattering. The reproducibility of the technique and the high optical quality of the wires suggest applications in fields such as nonlinear plasmonics, near-field scanning optical microscope tips, cylindrical polarizers, optical sensing and telecommunications. (C) 2011 Optical Society of America