Water-Based Coherent Detection of Broadband Terahertz Pulses

太赫兹辐射 激光器 光学 极化(电化学) 宽带 材料科学 太赫兹光谱与技术 光电子学 物理
作者
Yong Tan,Hang Zhao,Wei-Min Wang,Rui Zhang,Yue-Jin Zhao,Cun-Lin Zhang,Xi-Cheng Zhang,Liang-Liang Zhang
出处
期刊:Physical Review Letters [American Physical Society]
卷期号:128 (9)
标识
DOI:10.1103/physrevlett.128.093902
摘要

Both solids and gases have been demonstrated as the materials for terahertz (THz) coherent detection. The gas-based coherent detection methods require a high-energy probe laser beam and the detection bandwidth is limited in the solid-based methods. Whether liquids can be used for THz detection and relax these problems has not yet been reported, which becomes a timely and interesting topic due to the recent observation of efficient THz wave generation in liquids. Here, we propose a THz coherent detection scheme based on liquid water. When a THz pulse and a fundamental laser beam are mixed on a free-flowing water film, a second harmonic (SH) beam is generated as the plasma is formed. Combining this THz-induced SH beam with a control SH beam, we successfully achieve the time-resolved waveform of the THz field with the frequency range of 0.1-18 THz. The required probe laser energy is as low as a few microjoules. The sensitivity of our scheme is 1 order of magnitude higher than that of the air-based method under comparable detection conditions. The scheme is sensitive to the THz polarization and the phase difference between the fundamental and control SH beams, which brings direct routes for optimization and polarization sensitive detection. Energy scaling and polarization properties of the THz-induced beam indicate that its generation can be attributed to a four-wave mixing process. This generation mechanism makes simple relationships among the probe laser, THz-induced SH, and THz field, favorable for robustness and flexibility of the detection device.
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