Toward remote sensing with broadband terahertz waves
Toward remote sensing with broadband terahertz waves
复制标题
利用宽带太赫兹波进行遥感
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
Xi
中科院分区：
文献类型：
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作者：
B. Clough;Xi
本文研究了用于太赫兹短脉冲电磁辐射遥感的激光空气光子学。通过激光电离过程，空气能够产生大于1 MV/cm的太赫兹场强度、超过100太赫兹的有用带宽和高度定向的发射模式。在电离和等离子体形成之后，所发射的等离子体声学或荧光可以通过外部太赫兹场来调制，以用作全向宽带电磁传感器。这些结果有助于缩小电子和光学频率之间曾经存在的“太赫兹差距”，并且开发的声学和荧光检测方法为扩展太赫兹波技术的有用范围提供了有前途的新途径。实验结果表明，通过听声音或看荧光，在远距离相干检测宽带太赫兹波是可行的。
This paper studies laser air-photonics used for remote sensing of short pulses of electromagnetic radiation at terahertz frequency. Through the laser ionization process, the air is capable of generating terahertz field strengths greater than 1 MV/cm, useful bandwidths over 100 terahertz, and highly directional emission patterns. Following ionization and plasma formation, the emitted plasma acoustic or fluorescence can be modulated by an external terahertz field to serve as omnidirectional, broadband, electromagnetic sensor. These results help to close the “terahertz gap” once existing between electronic and optical frequencies, and the acoustic and fluorescence detection methodologies developed provide promising new avenues for extending the useful range of terahertz wave technology. Our experimental results indicate that by hearing the sound or seeing the fluorescence, coherent detection of broadband terahertz wave at remote distance is feasible.