Strong Spatial Confinement of Terahertz Wave inside Femtosecond Laser Filament

被引：35

作者：

Zhao, Jiayu ^{[1
,3
]}

Chu, Wei ^{[2
]}

Wang, Zhi ^{[1
]}

Peng, Yan ^{[3
]}

Gong, Cheng ^{[1
]}

Lin, Lie ^{[1
]}

Zhu, Yiming ^{[3
,4
]}

Liu, Weiwei ^{[1
,4
]}

Cheng, Ya ^{[2
]}

Zhuang, Songlin ^{[3
,4
]}

Xu, Zhizhan ^{[2
]}

机构：

[1] Nankai Univ, Key Lab Opt Informat Sci & Technol, Minist Educ, Inst Modern Opt, Tianjin 300071, Peoples R China

[2] Chinese Acad Sci, Shanghai Inst Opt & Fine Mech, State Key Lab High Field Laser Phys, Shanghai 201800, Peoples R China

[3] Univ Shanghai Sci & Technol, Coll Opt & Elect Informat Engn, Shanghai Key Lab Modern Opt Syst, Shanghai 200093, Peoples R China

[4] Cooperat Innovat Ctr Terahertz Sci, 4,Sect 2,North Jianshe Rd, Chengdu 610054, Peoples R China

来源：

ACS PHOTONICS | 2016年 / 3卷 / 12期

基金：

中国国家自然科学基金;

关键词：

spatial confinement; terahertz wave; ferntosecond laser; filamentation; SUBWAVELENGTH-DIAMETER SILICA; GENERATION; PULSES; GUIDES; AIR; TECHNOLOGY; RESOLUTION; WIRES;

D O I：

10.1021/acsphotonics.6b00512

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

In this paper, a new experimental phenomenon is demonstrated. During the femtosecond laser filamentation, the generated terahertz (THz) pulse has been found to be strongly confined inside the plasma channel, reaching a spatial diameter of a few tens of micrometers. It has been attributed to the formation of a plasma negative dielectric waveguide induced by the transverse inhomogeneous plasma density distribution. The new experimental phenomenon will renew the understanding of the THz wave generation and propagation dynamics during the femtosecond laser and air plasma interaction. Due to this strong spatial confinement, THz electric field strength could be enhanced by orders of magnitude, potentially providing a new approach to performing THz nonlinear optics with low laser energy.

引用

页码：2338 / 2343

页数：6

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