From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
When an intense ultrafast laser pulse is focused into a free-flowing water film, broadband terahertz (THz) radiation is emitted through the interaction between strong laser fields and liquid water molecules. Experimental results show that THz waves generated from liquid water have very different characteristics in comparison to those from other THz sources such as solids and gases. The mechanism for the THz wave generation process is currently attributed to the plasma formation in the bulk water. This demonstration may find potential applications in biological imaging and provide new tools in the field of nonlinear laser-liquid interactions.
Jianming Dai, Qi Jin, Yiwen E., Kaia Williams, and X.-C. Zhang, "Using liquid water as broadband terahertz wave emitter," Proc. SPIE 10656, Image Sensing Technologies: Materials, Devices, Systems, and Applications V, 106561L (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 19, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2304554.
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