Time-Domain Modelling of Pulsed Photoconducting Sources - Part II

Characterization of an LT GaAs Bow-Tie Antenna

Journal article (2023)

Authors

A. Fiorellini Bernardis Tera-Hertz Sensing - EEMCS
P.M. Sberna EKL Processing - EEMCS
J. Bueno Lopez Electronics - EEMCS
H. Zhang Tera-Hertz Sensing - EEMCS
Nuria Llombart Tera-Hertz Sensing - EEMCS
A. Neto Tera-Hertz Sensing - EEMCS
Research Group
Tera-Hertz Sensing (EEMCS) (TU Delft)
Copyright: © 2023 A. Fiorellini Bernardis, P.M. Sberna, J. Bueno Lopez, H. Zhang, Nuria Llombart, A. Neto
DOI
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https://doi.org/10.1109/TAP.2023.3236763
THz technology THz radiated power Equivalent circuit THz sources Terahertz (THz) Photoconductive antennas (PCAs)
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Published Date

2023

Language

English

Reuse Rights

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Tera-Hertz Sensing

Abstract

Drude's description of the response of low-temperature gallium arsenide to optical pulse excitation is used to evaluate the components of a time-domain Norton equivalent circuit of a photoconductive antenna (PCA) source. The saturation of the terahertz (THz) radiated power occurring at large optical excitation levels was previously associated by the scientific community to radiation and charge screening of the bias. With the present circuit, we are able to model accurately the measured saturation as only due to the EM feedback from the antenna to the bias. The predicted THz radiated power is shown to match very accurately the measurements when the circuit is combined with an accurate description of the experimental conditions and the modeling of the THz quasi-optical (QO) channel.