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Coherent amplification of radiation from two phase-locked Josephson junction arrays
Stockholm University, Faculty of Science, Department of Physics.ORCID iD: 0000-0002-3131-8658
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Number of Authors: 52022 (English)In: Beilstein Journal of Nanotechnology, ISSN 2190-4286, Vol. 13, p. 1445-1457Article in journal (Refereed) Published
Abstract [en]

We analyze experimentally and theoretically mutual phase locking and electromagnetic interaction between two linear arrays with a large number of Josephson junctions. Arrays with different separation, either on the same chip or on two separate substrates are studied. We observe a large coherent gain, up to a factor of three, of emitted power from two simultaneously biased arrays, compared to the sum of powers from two individually biased arrays. The phenomenon is attributed to the phase locking of junctions in different arrays via a common electromagnetic field. Remarkably, the gain can exceed the factor of two expected for a simple constructive interference of two oscillators. The larger gain is explained by an additional consequence of mutual interaction between two large arrays. Mutual phase locking of large arrays does not only result in constructive interference outside the arrays, but also improved synchronization of junctions inside each array. Our conclusion is supported by numerical modelling.

Place, publisher, year, edition, pages
2022. Vol. 13, p. 1445-1457
Keywords [en]
coherent radiation, Josephson junction arrays, numerical modelling, single-strip line, synchronization
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:su:diva-213398DOI: 10.3762/bjnano.13.119ISI: 000893234800001PubMedID: 36570615OAI: oai:DiVA.org:su-213398DiVA, id: diva2:1724134
Available from: 2023-01-05 Created: 2023-01-05 Last updated: 2023-01-05Bibliographically approved

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Krasnov, Vladimir M.

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