Directionally enhanced probe for side-illumination Tip enhanced spectroscopy
Directionally enhanced probe for side-illumination Tip enhanced spectroscopy
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用于侧照的定向增强探头 尖端增强光谱
DOI：
10.1002/jrs.4946
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发表时间：
2016
影响因子：
2.5
通讯作者：
Gong Qihuang
中科院分区：
文献类型：
--
作者：
Shen Hongming;Lu Guowei;Cao Zhengmin;He Yingbo;Cheng Yuqing;Li Jiafang;Li Zhi-Yuan;Gong Qihuang
我们研究了由具有周期性浅表面凹槽的锥形金属尖端组成的无孔近场探针的高性能。系统地分析了侧面照明针尖增强光谱方案中单个发射极在尖端附近的自发辐射。与传统的裸露锥形针尖相比，波纹探针不仅能强烈增强局部激发场，还能调制发射方向性，从而实现高收集效率和信噪比。具体来说，我们建议，一个不对称的尖端增强光谱探针包含两个不同长度的纳米棒在顶点实现单向发射。辐射模式对发射波长和发射器位置敏感，这可以通过抑制不需要的信号来提高信噪比。这种非对称波纹探针具有广泛的应用前景，包括在单分子水平上提高针尖增强光谱的检测效率。版权所有© 2016约翰威利父子有限公司.
We investigate the high performance of an apertureless near‐field probe consisting of a tapered metal tip with periodic shallow surface grooves. The spontaneous emission of a single emitter near the apex is systematically analyzed for side‐illumination tip enhanced spectroscopy scheme. In contrast to a conventional bare tapered tip, the corrugated probe not only strongly enhances the local excitation field, but also modulates the emission directivity, leading to high collection efficiency and signal‐to‐noise ratio. Specifically, we propose that an asymmetric tip enhanced spectroscopy probe containing two different length nanorods at the apex realizes unidirectional emissions. The radiation pattern is sensitive to the emission wavelengths and the emitter positions, which can increase the signal‐to‐noise ratio through suppression of the undesired signal. The proposed asymmetrical corrugated probe possesses a wide range of potential applications, including increasing the detection efficiency of tip enhanced spectroscopy at the single molecule level. Copyright © 2016 John Wiley & Sons, Ltd.