Near field excited state imaging via stimulated electron energy gain spectroscopy of localized surface plasmon resonances in plasmonic nanorod antennas
Near field excited state imaging via stimulated electron energy gain spectroscopy of localized surface plasmon resonances in plasmonic nanorod antennas
复制标题
通过等离子体纳米棒天线中局域表面等离子体共振的受激电子能量增益光谱进行近场激发态成像
DOI：
10.1038/s41598-020-69066-z
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发表时间：
2020
影响因子：
4.6
通讯作者：
Rack, Philip D.
中科院分区：
文献类型：
--
作者：
Collette, Robyn;Garfinkel, David A.;Hu, Zhongwei;Masiello, David J.;Rack, Philip D.
连续波 (cw) 光子受激电子能量损失和增益光谱（sEELS 和 sEEGS）用于对纳米棒天线中光受激局域表面等离子体共振 (LSPR) 模式的近场进行成像。配备纳米操纵器和光纤耦合激光二极管的光学传输系统用于在（扫描）透射电子显微镜中同时照射等离子体纳米结构。改变纳米棒的长度，使得它们= 1、2和3 LSPR模式与激光能量共振，并测量这些模式的光刺激近场光谱和图像。还研究了各种纳米棒取向以探索延迟效应。光学和电子束模拟用于合理化观察到的图案。正如预期的那样，奇数模式光学上明亮并导致观察到的 sEEG 响应。它们= 2暗模式不会产生sEEG响应，然而，当倾斜使得延迟效应起作用时，sEEG信号出现。因此，我们证明连续波 sEEGS 是对任一宇称的全套纳米棒等离子体激元模式的近场进行成像的有效工具。
Continuous wave (cw) photon stimulated electron energy loss and gain spectroscopy (sEELS and sEEGS) is used to image the near field of optically stimulated localized surface plasmon resonance (LSPR) modes in nanorod antennas. An optical delivery system equipped with a nanomanipulator and a fiber-coupled laser diode is used to simultaneously irradiate plasmonic nanostructures in a (scanning) transmission electron microscope. The nanorod length is varied such that them= 1, 2, and 3 LSPR modes are resonant with the laser energy and the optically stimulated near field spectra and images of these modes are measured. Various nanorod orientations are also investigated to explore retardation effects. Optical and electron beam simulations are used to rationalize the observed patterns. As expected, the odd modes are optically bright and result in observed sEEG responses. Them= 2 dark mode does not produce a sEEG response, however, when tilted such that retardation effects are operative, the sEEG signal emerges. Thus, we demonstrate that cw sEEGS is an effective tool in imaging the near field of the full set of nanorod plasmon modes of either parity.
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影响因子：
3.3
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影响因子：
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影响因子：
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