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Terahertz wave generation from ring-Airy beam induced plasmas and remote detection by terahertz-radiation- enhanced-emission-of-fluorescence: a review
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作者 Kang LIU Pingjie HUANG Xi-Cheng ZHANG 《中国光电子学前沿:英文版》 EI CSCD 2019年第2期117-147,共31页
With the increasing demands for remote spectroscopy in many fields ranging from homeland security to environmental monitoring, terahertz (THz) spectroscopy has drawn a significant amount of attention because of its ca... With the increasing demands for remote spectroscopy in many fields ranging from homeland security to environmental monitoring, terahertz (THz) spectroscopy has drawn a significant amount of attention because of its capability to acquire chemical spectral signatures non-invasively. However, advanced THz remote sensing techniques are obstructed by quite a few factors, such as THz waves being strongly absorbed by water vapor in the ambient air, difficulty to generate intense broadband coherent THz source remotely, and hard to transmit THz waveform information remotely without losing the signal to noise ratio, etc. In this review, after introducing different THz air-photonics techniques to overcome the difficulties of THz remote sensing, we focus mainly on theoretical and experimental methods to improve THz generation and detection performance for the purpose of remote sensing through tailoring the generation and detection media, air-plasma. For the THz generation part, auto-focusing ring-Airy beam was introduced to enhance the THz wave generation yield from two-color laser induced air plasma. By artificially modulated exotic wave packets, it is exhibited that abruptly auto-focusing beam induced air-plasma can give an up to 5.3-time-enhanced THz wave pulse energy compared to normal Gaussian beam induced plasma under the same conditions. At the same time, a red shift on the THz emission spectrum is also observed. A simulation using an interference model to qualitatively describe these behaviors has be developed. For the THz detection part, the results of THz remote sensing at 30 m using THz-radiation-enhanced-emission- of-fluorescence (THz-REEF) technique are demonstrated, which greatly improved from the 10 m demonstration last reported. The THz-REEF technique in the counter-propagation geometry was explored, which is proved to be more practical for stand-off detections than co-propagation geometry. We found that in the counter- propagating geometry the maximum amplitude of the REEF signal is comparable to that in the 展开更多
关键词 ultrafast TERAHERTZ (THz) techniques THZ air- photonics ring-Airy beams THz-radiation-enhanced-emis- sion-of-fluorescence (THz-REEF) of air-plasma in co- propagation geometry THz-REEF of air-plasma in coun-ter-propagation geometry
太赫兹波远程探测的最新研究进展 预览 被引量:2
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作者 吴四清 刘劲松 +1 位作者 汪盛烈 胡兵 《激光与红外》 CAS CSCD 北大核心 2013年第12期1325-1328,共4页
太赫兹波具有许多独特的性质,在很多科学技术领域有着广泛的应用前景。然而,由于水汽对太赫兹波存在强烈的吸收,使得太赫兹波在空气中的传输距离十分有限,限制了太赫兹波的应用,如何实现太赫兹波的远程探测成为太赫兹领域的研究重点。... 太赫兹波具有许多独特的性质,在很多科学技术领域有着广泛的应用前景。然而,由于水汽对太赫兹波存在强烈的吸收,使得太赫兹波在空气中的传输距离十分有限,限制了太赫兹波的应用,如何实现太赫兹波的远程探测成为太赫兹领域的研究重点。本文介绍了最近出现的THz-REEF和TEA两种远程太赫兹波探测方法,分析了探测过程和探测系统的结构,解释了内在的物理机制,并对其应用进行了展望。 展开更多
关键词 太赫兹波 激光脉冲 THz-REEF TEA
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