Hot Electron Generation and Cathodoluminescence Nanoscopy of Chiral Split Ring Resonators
Hot Electron Generation and Cathodoluminescence Nanoscopy of Chiral Split Ring Resonators
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DOI：
10.1021/acs.nanolett.6b02154
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发表时间：
2016-08-01
期刊：
影响因子：
10.8
通讯作者：
Kall, Mikael
中科院分区：
文献类型：
--
作者：
Fang, Yurui;Verre, Ruggero;Kall, Mikael
三维手性等离子体纳米结构已被证明能够显着提高光子-自旋选择性光-物质相互作用，可能导致新的光子学，分子光谱学和基于圆偏振光的光捕获应用。在这里，我们表明，手性开口环金纳米谐振器接口的宽带隙半导体表现出的对比度，在热电子传输速率之间的左手和右手的可见光，基本上模仿远场圆二色性的结构。我们追溯这种效果的起源到差分激发的最薄的部分的分裂环结构，使用二向色敏感的阴极发光成像与纳米空间分辨率。结果突出了纳米结构的近场和远场手性响应之间错综复杂的相互作用，并建立了一个明确的联系，新兴领域的热载流子等离子体与许多潜在的应用在太阳能和太阳光收集。
Three-dimensional chiral plasmonic nanostructures have been shown to be able to dramatically boost photon-spin selective light-matter interactions, potentially leading to novel photonics, molecular spectroscopy, and light-harvesting applications based on circularly polarized light. Here, we show that chiral split-ring gold nanoresonators interfaced to a wide band gap semiconductor exhibit a contrast in hot-electron transfer rate between left-handed and right-handed visible light that essentially mimics the far-field circular dichroism of the structures. We trace down the origin of this effect to the differential excitation of the thinnest part of the split-ring structures using dichroic-sensitive cathodoluminescence imaging with nanometer spatial resolution. The results highlight the intricate interplay between the near-field and far field chiral response of a nanostructure and establishes a clear link to the emerging field of hot carrier plasmonics with numerous potential applications in photocatalysis and solar light harvesting.