Influence of inductance of photo-conductive terahertz source circuit on its radiation characteristics

1.School of Automation and Information Engineering,Xi '2.' University of Technology,Xi ';5.School of Faculty of Science, Xi ' University of Technology

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    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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  • Received:March 27,2022
  • Revised:April 08,2022
  • Adopted:April 14,2022
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