光电导太赫兹源回路电感对其辐射特性的影响
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作者单位:

1.西安理工大学 自动化与信息工程学院;2.西安理工大学 理学院

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O43

基金项目:

国家重点研发计划S(2017YFA0701005)、国家自然科学基金重大科学仪器研制专项 (61427814)、国家基金青年科学(62003259).


Influence of inductance of photo-conductive terahertz source circuit on its radiation characteristics
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1.School of Automation and Information Engineering,Xi '2.'3.an University of Technology,Xi '4.an;5.School of Faculty of Science, Xi '6.an University of Technology

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    摘要:

    光电导太赫兹源(photo-conductive antenna,PCA)已广泛用于太赫兹时域光谱系统(THz-TDS)。在THz-TDS系统中,处于偏置状态的PCA被飞秒激光触发因光生载流子在偏置电场下的加速运动而向自由空间辐射太赫兹波,同时在PCA偏置回路中形成脉冲电流。通常给PCA加载偏置电压的回路有不同结构的电路设计,因此PCA装架的基板回路不可避免地存在一定电感,由此引起的电磁惯性会显著影响回路中脉冲电流的脉宽,电流脉冲的脉宽随回路电感的增大而展宽。那么PCA回路电感是否会影响PCA向自由空间辐射THz波的特性,这是设计PCA基板电路所面临的问题。本文在PCA回路中加入不同电感值的电感元件,实验测试了PCA辐射THz波的时域波形和频谱,结果表明PCA回路电感的数值对PCA辐射THz波没有明显影响,从而对不同场合应用的PCA基板结构和电路设计提供了实验基础。

    Abstract:

    Photo-conductive terahertz source (PCA) has been widely used in terahertz time domain spectral system (THz-TDS). In the THZ-TDS system, the biased PCA is triggered by femtosecond laser to radiate terahertz waves to free space due to the accelerated motion of photogenerated carriers under the bias electric field, and pulse current is formed in the PCA bias loop. Generally, the circuit that loads bias voltage to PCA has different circuit designs, so there is inevitably a certain inductance in the base circuit of PCA mounting. The electromagnetic inertia caused by this will significantly affect the pulse width of the current in the circuit, and the pulse width of the current pulse will be widened with the increase of the circuit inductance. Therefore, whether the inductance of The PCA circuit will affect the characteristic of THz wave radiated from PCA to free space is a problem faced by the design of the circuit based on PCA. In this paper, inductance elements with different inductance values are added to the PCA circuit, and the time domain waveform and spectrum of THz wave radiated by PCA are tested experimentally. The results show that the value of the inductance in the PCA circuit has no obvious effect on the THz wave radiated by PCA, thus providing experimental basis for the design of THz PCA substrate circuit applied in different occasions.

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  • 收稿日期:2022-03-27
  • 最后修改日期:2022-04-08
  • 录用日期:2022-04-14
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