Tuning of strong nonlinearity in radio-frequency superconducting-quantum-interference-device meta-atoms

Ethan Zack, Daimeng Zhang, Melissa Trepanier, Jingnan Cai, Tamin Tai, Nikos Lazarides, Johanne Hizanidis, Steven M. Anlage

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    1 Scopus citations


    Strong nonlinearity of a self-resonant radio-frequency (rf) superconducting-quantum-interference-device (SQUID) meta-atom is explored via intermodulation (IM) measurements. Previous work in zero dc magnetic flux showed a sharp onset of IM response as the frequency sweeps through the resonance. A second onset at higher frequency was also observed, creating a prominent gap in the IM response. By extending those measurements to nonzero dc flux, different dynamics are revealed, including dc flux tunability of the aforementioned gaps and enhanced IM response near geometric resonance of the rf SQUID. These features observed experimentally are understood and analyzed theoretically through a combination of a steady-state analytical modeling and a full numerical treatment of the rf SQUID dynamics. The latter in addition predicts the presence of chaos in narrow parameter regimes. The understanding of intermodulation in rf SQUID metamaterials is important for producing low-noise amplification of microwave signals and tunable filters.

    Original languageBritish English
    Article number044202
    JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
    Issue number4
    StatePublished - Apr 2022


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