Strong Terahertz Radiation from a Liquid-Water Line

被引：89

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：

国家重点研发计划; 北京市自然科学基金;

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

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