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Journal of Physics Conference Series

Investigation of nonlinear superconducting microwave resonators including Nb Josephson junctions and SQUID arrays

M. Khabipov, Brigitte Mackrodt, R. Dolata, Thomas Scheller, Alexander B Zorin

Published May 12, 2014• 1 citation
Publisher

Abstract

Motivated by the realization of bifurcation regimes of operation, we report on experiments with superconducting microwave resonators comprising short serial arrays of Nb/AlO x /Nb SIS Josephson junctions and low-inductance SQUIDs. These elements provide sufficiently large Josephson inductance L J ∝ N (N is the number of elements in the chain) enabling nonlinear dynamics of the circuits and detection of low power signals.

DOI
10.1088/1742-6596/507/4/042016

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Motivated by the realization of bifurcation regimes of operation, we report on experiments with superconducting microwave resonators comprising short serial arrays of Nb/AlO x /Nb SIS Josephson junctions and low-inductance SQUIDs. These elements provide sufficiently large Josephson inductance L J ∝ N (N is the number of elements in the chain) enabling nonlinear dynamics of the circuits and detection of low power signals.
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We discuss the dynamics of two-dimensional arrays of Josephson junctions in the overdamped regime. Our discussion is restricted to “classical” arrays, where the Josephson coupling energy is much larger than the charging energy. Such arrays represent a highly controllable system to study the dynamics of vortices. Furthermore, they are promising for applications like, e.g., a coherent microwave source. The experiments have been performed with arrays of Nb/AlOx/Nb-tunnel junctions allowing a high degree of junction uniformity across the array. The typical array size is 10×10 junctions. We show spatially resolved measurement results obtained by low-temperature scanning electron microscopy, and demonstrate the merit of these investigations for the clarification of complex regimes of vortex dynamics as well as for the optimization of coherent microwave sources. In the case of external microwave irradiation with increasing power, a continuous transition from a non-locked to a completely locked oscillation state is presented. In addition, we report on the quantitative measurement of the emitted microwave power from the arrays.
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A new type of cryoelectronic microwave circuits in Nb/Al/sub 2/O/sub 3//Nb technology for the generation of frequency-scaled Josephson voltages is presented. The circuits consist of superconducting microstripline resonators with series arrays of Josephson tunnel junctions located on the rf current antinodes. The circuits are designed to obtain highly accurate Josephson voltages at low rf power levels and low drive frequencies. At present, we have observed Josephson voltages up to 0.66 V in a resonator circuit with 1456 junctions.