On the Power Radiated by Photo Conductive Sources

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Abstract

The time evolution of voltages and currents in a pulsed photo conductive antenna (PCA) source is evaluated resorting to a rigorous procedure that stems from semiconductor physics first, to define the phenomena involved in the generation of the photocurrent, and then relies on an equivalent circuit in time domain, providing a direct estimation of the power generated by the PCA as well as its spectral distribution. The circuit model is validated via a campaign of measurements of standard PC antenna sources. The saturation phenomena in the THz radiated power occurring at large optical excitation levels, previously observed by the scientific community and associated to different phenomena, are accurately predicted by the present method, which ascribe their main cause to the feedback from the antenna: indeed, the electromagnetic field generated by the device tend to reduce the strength of the forcing field used to accelerate the photo-carriers.

Original languageEnglish
Number of pages1
DOIs
Publication statusPublished - 2021
Event46th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2021 - Chengdu, China
Duration: 30 Aug 20213 Sept 2021

Conference

Conference46th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2021
Country/TerritoryChina
CityChengdu
Period30/08/213/09/21

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care
Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Keywords

  • Equivalent circuit
  • Photoconductive antennas (PCAs)
  • Terahertz (THz)
  • THz radiated power
  • THz sources
  • THz technology

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