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Mikhail Fistul
복잡계 이론물리 연구단
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Two-tone spectroscopy of a SQUID metamaterial in the nonlinear regime

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Title
Two-tone spectroscopy of a SQUID metamaterial in the nonlinear regime
Author(s)
E. I. Kiselev; A. S. Averkin; M. V. Fistul; V. P. Koshelets; A. V. Ustinov
Publication Date
2019-12
Journal
PHYSICAL REVIEW RESEARCH, v.1, no., pp.033096 -
Publisher
AMERICAN PHYSICAL SOCIETY
Abstract
Compact microwave resonantors made of superconducting rings containing Josephson junctions (SQUIDs) are attractive candidates for building frequency-tunable metamaterials with low losses and pronounced non- linear properties. We explore the nonlinearity of a SQUID metamaterial by performing a two-tone resonant spectroscopy. The small-amplitude response of the metamaterial under strong driving by a microwave pump tone is investigated experimentally and theoretically. The transmission coefficient S21 of a weak probe signal is measured in the presence of the pump tone. When increasing the power of the pump, we observe pronounced oscillations of the SQUID’s resonance frequency fres. The shape of these oscillations varies significantly with the frequency of the pump tone fdr. The response to the probe signal displays instabilities and sidebands. A state with strong second-harmonic generation is observed. We provide a theoretical analysis of these observations, which is in good agreement with the experimental results. C.American Physical Society
URI
https://pr.ibs.re.kr/handle/8788114/6725
ISSN
2643-1564
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
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