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Time-Domain Equivalent Circuits for the Link Modeling Between Pulsed Photoconductive Sources and Receivers | IEEE Journals & Magazine | IEEE Xplore

Time-Domain Equivalent Circuits for the Link Modeling Between Pulsed Photoconductive Sources and Receivers


Abstract:

Photoconductive antennas (PCAs) are promising candidates for sensing and imaging applications. In recent years, our group has investigated their properties under pulsed l...Show More

Abstract:

Photoconductive antennas (PCAs) are promising candidates for sensing and imaging applications. In recent years, our group has investigated their properties under pulsed laser illumination in transmission using a time-domain (TD) Norton equivalent circuit. Here, we extend this analysis to the link between a photoconductive source and a receiver introducing for the latter a second TD Norton equivalent circuit. We also evaluate the transfer function of a dispersive quasi-optical (QO) link. Specifically, a field correlation approach based on the high-frequency techniques is used to evaluate the spectral transfer function between two bow–tie-based PCAs, including the QO link. The detected currents in the receiving circuit are reconstructed using stroboscopic sampling of the modeled THz pulses, equivalent to what is actually performed by THz TD systems. Both the amplitude and the waveforms of these currents are evaluated. The QO link is then experimentally characterized to validate the proposed methodology. The comparison between the simulations and the measurements is excellent.
Published in: IEEE Transactions on Terahertz Science and Technology ( Volume: 14, Issue: 3, May 2024)
Page(s): 311 - 326
Date of Publication: 12 February 2024

ISSN Information:


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