On the Power Radiated by Photo Conductive Sources

On the Power Radiated by Photo Conductive Sources

Fiorellini Bernardis, A. (TU Delft Tera-Hertz Sensing)
Zhang, H. (TU Delft Tera-Hertz Sensing)
Sberna, P.M. (TU Delft EKL Processing)
Bueno Lopez, J. (TU Delft Electronics)
Neto, A. (TU Delft Tera-Hertz Sensing)
Llombart, Nuria (TU Delft Tera-Hertz Sensing)

2021

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.

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

http://resolver.tudelft.nl/uuid:d7303900-3284-4ce8-9453-cf77cfcc6d18

https://doi.org/10.1109/IRMMW-THz50926.2021.9567350

2023-07-01

46th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2021, 2021-08-30 → 2021-09-03, Chengdu, China

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.

Institutional Repository

abstract

© 2021 A. Fiorellini Bernardis, H. Zhang, P.M. Sberna, J. Bueno Lopez, A. Neto, Nuria Llombart