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Science, technology, and application of THz air photonics

机译：太赫兹空气光子学的科学技术与应用

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摘要

The significant scientific and technological potential of terahertz (THz) wave sensing and imaging has been attracted considerable attention within many fields of research. However, the development of remote, broadband THz wave sensing technology is lagging behind the compelling needs that exist in the areas of astronomy, global environmental monitoring, and homeland security. This is due to the challenge posed by high absorption of ambient moisture in the THz range. Although various time-domain THz detection techniques have recently been demonstrated, the requirement for an on-site bias or forward collection of the optical signal inevitably prohibits their applications for remote sensing. The objective of this paper is to report updated THz air-plasma technology to meet this great challenge of remote sensing. A focused optical pulse (mJ pulse energy and femtosecond pulse duration) in gas creates a plasma, which can serve to generate intense, broadband, and directional THz waves in the far field.
机译：太赫兹（THz）波感测和成像的巨大科学技术潜力已在许多研究领域引起了相当大的关注。但是，远程宽带太赫兹波感测技术的发展落后于天文学，全球环境监测和国土安全领域的迫切需求。这是由于在THz范围内高吸收环境水分所带来的挑战。尽管最近已经证明了各种时域太赫兹检测技术，但是对于现场偏置或光信号的正向采集的要求不可避免地禁止了它们在遥感中的应用。本文的目的是报告更新的太赫兹空气等离子体技术，以应对遥感这一巨大挑战。气体中的聚焦光脉冲（mJ脉冲能量和飞秒脉冲持续时间）产生等离子体，该等离子体可用于在远场中产生强烈的，宽带的和定向的THz波。

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