论文标题
亚毫秒时间动力学的单脉冲时间分辨的Terahertz光谱
Single-pulse time-resolved terahertz spectroscopy of sub-millisecond time dynamics
论文作者
论文摘要
慢动作电影不仅令人着迷，而且还使我们能够看到复杂现象的机械动力学的复杂细节。如果每个框架中的图像被Terahertz（THZ）波代替，则此类电影可以监测低能的共振并揭示快速的结构或化学转变。在这里，我们将THZ光谱与实时监测技术相结合，作为一种非侵入性光学探针，以每秒50K帧的速度解决不可复制现象。该概念基于分散傅立叶变换光谱验证，以实现THZ光谱数据的前所未有的采集速度，通过监测通过连续的谐振脉冲在硅中注入的热载体的亚毫秒动力学作为饱和密度来证明。我们预计，我们的实验配置将在以微秒分辨率和行业中的基础研究中启用新应用，尤其是作为高量化供应链监测系统的高量供应链监测系统，在THZ频率上揭示了快速不可逆的物理和化学过程至关重要的作用。
Slow motion movies are not only fascinating to watch, they also allow us to see intricate details of the mechanical dynamics of complex phenomena. If the images in each frame are replaced by terahertz (THz) waves, such movies can monitor low-energy resonances and reveal fast structural or chemical transitions. Here, we combine THz spectroscopy as a non-invasive optical probe with a real-time monitoring technique to resolve non-reproducible phenomena at 50k frames per second. The concept, based on dispersive Fourier transform spectroscopy to achieve unprecedented acquisition speed of THz spectroscopy data, is demonstrated by monitoring sub-millisecond dynamics of hot carriers injected in silicon by successive resonant pulses as a saturation density is established. We anticipate that our experimental configuration will play a crucial role in revealing fast irreversible physical and chemical processes at THz frequencies with microsecond resolution to enable new applications in fundamental research as well as in industry, notably as a rapid supply chain monitoring system in high-volume manufacturing.
