Resonant tunnelling diode terahertz sources with up to 1 mW output power in the J-band

Al-Khalidi, A. , Alharbi, K. H., Wang, J., Morariu, R. , Wang, L., Khalid, A., Figueiredo, J. and Wasige, E. (2019) Resonant tunnelling diode terahertz sources with up to 1 mW output power in the J-band. IEEE Transactions on Terahertz Science and Technology, (doi:10.1109/TTHZ.2019.2959210) (Early Online Publication)

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Abstract

Terahertz (THz) oscillators based on resonant tunneling diodes (RTDs) have relatively low output power, tens to hundreds of microwatts. The conventional designs employ sub-micron sized RTDs to reduce the device self-capacitance and, as a result, realise higher oscillation frequencies. However, reducing the RTD device size leads to lower output power. In this paper we present RTD oscillators which can employ one or two RTD devices of relatively large size, 9 - 25 μm2, for high power and, at the same time, can oscillate at THz frequencies. This is achieved through low resonating inductances realized by microstrip or coplanar waveguide (CPW) transmission line short stubs with low characteristic impedances (Z0), which have lower inductance values per unit length and so compensate the increase of the self-capacitance of large area RTD devices. Thus, fabrication using only photolithography is possible. It is also shown that device sizing, which is limited only by bias stability considerations, does not limit device bandwidth. Further, we report a new way to estimate the RTD oscillator output power with frequency. A series of oscillators with oscillation frequencies in the 245 - 309 GHz range and output powers from 0.1 - 1 mW have been demonstrated showing the feasibility of the proposed approach.

Item Type:Articles
Status:Early Online Publication
Refereed:Yes
Glasgow Author(s) Enlighten ID:Wasige, Professor Edward and Morariu, Razvan and Wang, Dr Jue and Al-Khalidi, Dr Abdullah
Authors: Al-Khalidi, A., Alharbi, K. H., Wang, J., Morariu, R., Wang, L., Khalid, A., Figueiredo, J., and Wasige, E.
College/School:College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:IEEE Transactions on Terahertz Science and Technology
Publisher:IEEE
ISSN:2156-342X
ISSN (Online):2156-3446
Published Online:12 December 2019
Copyright Holders:Copyright © 2019 IEEE
First Published:First published in IEEE Transactions on Terahertz Science and Technology 2019
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
166941Compact MMIC Teraherz Sources in the 0.1-1 THz RangeEdward WasigeEngineering and Physical Sciences Research Council (EPSRC)EP/J019747ENG - Electronics & Nanoscale Engineering
300679Terahertz based Ultra High Bandwidth Wireless Access NetworksEdward WasigeEuropean Commission (EC)761579ENG - Electronics & Nanoscale Engineering