Two-tone spectroscopy of a SQUID metamaterial in the nonlinear regime

E. I. Kiselev; A. S. Averkin; M. V. Fistul; V. P. Koshelets; A. V. Ustinov

doi:10.1103/PhysRevResearch.1.033096

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Two-tone spectroscopy of a SQUID metamaterial in the nonlinear regime

E. I. Kiselev, A. S. Averkin, M. V. Fistul, V. P. Koshelets, A. V. Ustinov

DOI 10.1103/PhysRevResearch.1.033096 · Physical Review Research

T1

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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 nonlinear 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown