Mechanism and applications of weakly ionized plasma terahertz wave detector
Mechanism and applications of weakly ionized plasma terahertz wave detector
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发表时间：
2013
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通讯作者：
L. Hou;Xiaowei Han;W. Shi
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作者：
L. Hou;Xiaowei Han;W. Shi
放电氖产生的等离子体已被成功地用于太赫兹（THz）波探测。然而，检测机制存在争议。有研究者提出THz波增强电离电流，也有研究者提出THz波增强扩散电流。从理论上分析了探测机制，发现弱电离等离子体中的电子可以从入射的太赫兹辐射中获得能量，并将电子与激发态中性原子的激发碰撞转化为电离碰撞，从而导致电离电流的增加。设计了一个实验，并验证了该机制。介绍了弱电离等离子体探测器在电磁波探测和太赫兹成像中的应用。
Plasma generated in a discharged neon lamp has been successfully used for terahertz (THz) wave detection. However, the detection mechanisms are disputed. Some researchers advance that the THz wave enhances ionization current, and other researchers propose THz wave enhances diffusion current. We theoretically analyzed the detection mechanism, and found the electrons in the weakly ionized plasma could obtain energy from the incident THz radiation and convert excitation collisions of electrons with excited neutral atoms into ionization collisionsresulting in the increasing of the ionization current. An experiment was designed and testified the mechanism. Some applications of the weakly ionized plasma detector in electromagnetic wave detection and THz imaging were demonstrated.