期刊
PHYSICAL REVIEW APPLIED
卷 12, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevApplied.12.014005
关键词
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资金
- Beijing Natural Science Foundation [JQ18015]
- National Key R&D Program of China [2018YFA0404801]
- Natural Science Foundation of China [11775302, 11721091, 11520101003]
- Science Challenge Project of China [TZ2016005]
- Army Research Office
- [US ARMY W911NF-17-1-0428]
Terahertz radiation generation from liquid water has long been considered impossible due to strong absorption. A few very recent works reported terahertz generation from water, but the mechanism is not clear and the efficiency demands to be enhanced. We show experimentally that strong single-cycle terahertz radiation with field strength of 0.2 MV cm(-1) is generated from a water line (or column) of approximately 200 mu m in diameter irradiated by a mJ femtosecond laser beam. This strength is 100-fold higher than that produced from air using single-color pumping. We attribute the mechanism to the laser-ponderomotive-force-induced current with the symmetry broken around the water-column interface. This mechanism can explain our following observations: the radiation can be generated only when the laser propagation axis deviates from the column center; the deviation determines its field strength and polarity; it is always p polarized no matter whether the laser is p or s polarized. This study provides a simple and efficient scheme of table-top terahertz sources based on liquid water.
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