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Modelling and measurement of the absolute level of power radiated by antenna integrated THz UTC photodiodes

Natrella, M; Liu, CP; Graham, C; Van Dijk, F; Liu, H; Renaud, CC; Seeds, AJ; (2016) Modelling and measurement of the absolute level of power radiated by antenna integrated THz UTC photodiodes. Optics Express , 24 (11) pp. 11793-11807. 10.1364/OE.24.011793. Green open access

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Abstract

We determine the output impedance of uni-travelling carrier (UTC) photodiodes at frequencies up to 400 GHz by performing, for the first time, 3D full-wave modelling of detailed UTC photodiode structures. In addition, we demonstrate the importance of the UTC impedance evaluation, by using it in the prediction of the absolute power radiated by an antenna integrated UTC, over a broad frequency range and confirming the predictions by experimental measurements up to 185 GHz. This is done by means of 3D full-wave modelling and is only possible since the source (UTC) to antenna impedance match is properly taken into account. We also show that, when the UTC-to-antenna coupling efficiency is modelled using the classical junction-capacitance/series-resistance concept, calculated and measured levels of absolute radiated power are in substantial disagreement, and the maximum radiated power is overestimated by a factor of almost 7 dB. The ability to calculate the absolute emitted power correctly enables the radiated power to be maximised through optimisation of the UTC-to-antenna impedance match.

Type: Article
Title: Modelling and measurement of the absolute level of power radiated by antenna integrated THz UTC photodiodes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1364/OE.24.011793
Publisher version: http://dx.doi.org/10.1364/OE.24.011793
Language: English
Additional information: Copyright © 2016 Optical Society of America. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/1498986
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