Strong Terahertz Radiation from a Liquid-Water Line

被引:85
|
作者
Zhang, Liang-Liang [1 ,2 ]
Wang, Wei-Min [3 ,4 ]
Wu, Tong [5 ]
Feng, Shi-Jia [5 ]
Kang, Kai [1 ,2 ]
Zhang, Cun-Lin [1 ,2 ]
Zhang, Yan [1 ,2 ]
Li, Yu-Tong [4 ,6 ]
Sheng, Zheng-Ming [7 ,8 ,9 ,10 ]
Zhang, Xi-Cheng [1 ,2 ,11 ]
机构
[1] Capital Normal Univ, Dept Phys, Beijing Adv Innovat Ctr Imaging Theory & Technol, Beijing 100048, Peoples R China
[2] Capital Normal Univ, Dept Phys, Key Lab Terahertz Optoelect MoE, Beijing 100048, Peoples R China
[3] Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China
[4] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[5] Beijing Inst Technol, Sch Optoelect, Beijing Key Lab Precis Optoelect Measurement Inst, Beijing 100081, Peoples R China
[6] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
[7] Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland
[8] Shanghai Jiao Tong Univ, Key Lab Laser Plasmas MoE, Shanghai 200240, Peoples R China
[9] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China
[10] Tsung Dao Lee Inst, Shanghai 200240, Peoples R China
[11] Univ Rochester, Inst Opt, Rochester, NY 14627 USA
来源
PHYSICAL REVIEW APPLIED | 2019年 / 12卷 / 01期
基金
北京市自然科学基金; 国家重点研发计划;
关键词
LASER-PULSES; GENERATION; AIR; EMISSION;
D O I
10.1103/PhysRevApplied.12.014005
中图分类号
O59 [应用物理学];
学科分类号
摘要
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.
引用
收藏
页数:8
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