Collapsing-field-domain-based 200 GHz solid-state source

A simple miniature source generating pulse trains with a central frequency of ∼100 GHz and a duration of 50–100 ps has been demonstrated recently. The source is based on nanometer-scale collapsing field domains (CFDs) generated in the collector of an avalanching bipolar GaAs transistor. The central frequency is determined by the domain transient time across the collector, and thus, a routine increase in the oscillation frequency from 0.1 to 0.3–0.5 THz would require a reduction in the collector thickness by a factor of 3–5. This is not acceptable, however, since it would reduce the maximum blocking voltage affecting the achievable peak current across the avalanche switch. We suggest here a solution to this challenging problem by reducing the CFD travel distance while keeping the collector thickness unchanged. Here, the discovered and interpreted phenomenon of CFD collapse when entering a dense carrier plasma zone made it possible by means of bandgap engineering. A CFD emitter generating ∼200 GHz wavetrains of ∼100 ps in duration is demonstrated. This finding opens an avenue for the increase in the oscillation frequency without any reduction in the emitted power, by using a smart structure design.

Authors:
Vainshtein Sergey N., Duan Guoyong, Yuferev Valentin S., Zemlyakov Valery E., Egorkin Vladimir I., Kalyuzhnyy Nikolay A., Maleev Nikolai A., Egorov Anton Yu., Kostamovaara Juha T.

Publication type:
A1 Journal article – refereed

Place of publication:

Keywords:
6G Publication

Published:

Full citation:
Vainshtein, S. N., Duan, G., Yuferev, V. S., Zemlyakov, V. E., Egorkin, V. I., Kalyuzhnyy, N. A., Maleev, N. A., Egorov, A. Yu., Kostamovaara, J. T. (2019) Collapsing-field-domain-based 200 GHz solid-state source. Applied Physics Letters, 115 (12), 123501. https://doi.org/10.1063/1.5091616

DOI:
https://doi.org/10.1063/1.5091616

Read the publication here:
http://urn.fi/urn:nbn:fi-fe2019100230835