Terahertz-Field-Driven Scanning Tunneling Luminescence Spectroscopy
Terahertz-Field-Driven Scanning Tunneling Luminescence Spectroscopy
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DOI：
10.1021/acsphotonics.0c01755
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发表时间：
2021-01-27
期刊：
影响因子：
7
通讯作者：
Takeda, Jun
中科院分区：
文献类型：
--
作者：
Kimura, Kensuke;Morinaga, Yuta;Takeda, Jun
将太赫兹(THz)脉冲的强电场耦合到扫描隧道显微镜(STM)上，为在纳米空间分辨率下进行超快电子操纵和追踪量子动力学开辟了新的途径。在这里，我们将THz场驱动STM与光子探测系统相结合，展示了THz场驱动电子触发STM诱导发光的纳米光谱研究。由于光子丰富的光谱信息，我们能够分别测量和表征由太赫兹场和直流场驱动的非弹性电子隧穿激发的局域等离子体激元的发光。我们发现，在我们的实验中，由于使用了强THz脉冲，由THz场驱动电子激发的等离子体激元出现在极高的电压和电流区，这将为探索等离子体纳米腔中的光-物质相互作用提供一个独特的实验平台。我们的方法也为研究伴随亚皮秒时间和原子尺度空间分辨率的量子转换的量子能量动力学铺平了道路。
Coupling an intense electric field of terahertz (THz) pulse to a scanning tunneling microscope (STM) has opened new avenues for conducting ultrafast electron manipulation and tracking quantum dynamics at the nanometer spatial resolution. Here we combined the THz-field-driven STM with a photon detection system and demonstrated nanospectroscopic investigations of STM-induced luminescence triggered by THz-field-driven electrons. Owing to the abundant spectral information on photons, we were able to separately measure and characterize luminescence from a localized plasmon excited by THz-field- and DC-field-driven inelastic electron tunneling. We revealed that the plasmon excitation by THz-field-driven electrons in our experiment occurred at an extremely high voltage and current region due to the use of intense THz pulses, which would provide a unique experimental platform for exploring the light-matter interactions in a plasmonic nanocavity. Our method also paves the way for investigating quantum energy dynamics accompanying quantum conversions with subpicosecond time and atomic-scale spatial resolution.