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	Terahertz Radiation from Water Molecules Rotated by Femtosecond Laser Field
	Pu, Yezi1,2; Peng, Xiao-Yu1; Shi, Xuan1; Zhao, Hongquan1
	2024-07-22
摘要	THz radiation can be generated routinely from water plasmas by focusing femtosecond laser pulses on a water film or water line. However, there are no relevant reports on the THz generation from rotated water molecules driven directly by strong electric field of femtosecond laser pulses under non-plasma condition. Here, we develop a theoretical model of water molecules to study the interaction between laser electric field and water molecules based on quantum mechanics theory. We find that broadband THz radiation (bandwidth similar to 10 THz) can be generated through the transitions of rotational energy levels of the rotated water molecules driven by a linear polarization mid-infrared laser (laser intensity <= 10(12) W center dot cm(-2)). We demonstrate that the generated THz spectrum can be controlled by changing the laser intensity and its pulse duration. Moreover, for a Gaussian pump laser beam, the high-frequency components of THz wave increase gradually, while the low-frequency components decrease gradually when the laser pulse duration increases from 150 to 400 fs. Our results provide a new idea and possibility for THz generation from water.
关键词	Terahertz radiation Water molecules Non-ionizing Mid-infrared laser
DOI	10.1007/s10762-024-01000-0
发表期刊	JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
ISSN	1866-6892
页码	12
通讯作者	Peng, Xiao-Yu(xypeng@cigit.ac.cn)
收录类别	SCI
WOS记录号	WOS:001273433300001
语种	英语