材料科学
纳米光子学
纳米结构
等离子体子
纳米
纳米-
激发
纳米技术
近场和远场
光电子学
纳米柱
纳米光刻
激光器
光学
制作
复合材料
医学
物理
替代医学
工程类
病理
电气工程
作者
Pan Li,Deng Pan,Longkun Yang,Hong Wei,Shuli He,Hongxing Xu,Zhipeng Li
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2018-10-16
卷期号:11 (5): 2153-2161
被引量:19
摘要
Tapered metallic nanostructures that harbor surface plasmons are highly interesting for nanophotonic applications because of their waveguiding and field-focusing properties. Here, we developed a focused optical field induced solution synthesis for unique crystallized silver nano-needles. Under the focused laser spot, inhomogeneous Ag monomer concentration is created, which triggers the uniaxial growth of silver nanostructures along the radial direction with decreasing rate, forming nano-needle structures. These nano-needles are several micrometers long, with diameter attenuating from hundreds to tens of nanometers, and terminated by a sharp apex only a few nanometers in diameter. Moreover, nano-needles with atomically smooth surfaces show excellent performance for plasmonic waveguiding and unique near-field compression abilities. This nano-needle structure can be used for effective remote-excitation detection/sensing. We also demonstrate the assembling and picking up of nano-needles, which indicate potential applications in intracellular endoscopy, high resolution scanning tips, on-chip nanophotonic devices, etc.
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