Title :
High-frequency properties of two-dimensional Josephson junction arrays
Author :
Cawthorne, A.B. ; Barbara, P. ; Lobb, C.J.
Author_Institution :
Dept. of Phys., Maryland Univ., College Park, MD, USA
fDate :
6/1/1997 12:00:00 AM
Abstract :
Two-dimensional arrays of Josephson junctions have been shown to operate in a state in which the microwave oscillations of the junctions are phase-coherent. However, the performance of an array is strongly dependent on both the details of the load-coupling circuit and the characteristic parameters of the junctions. We have measured two-dimensional arrays of resistively shunted Josephson tunnel junctions which are capacitively coupled to a nearby detector junction. Changing the critical current of the junctions in our arrays, while keeping the junction parasitics and array coupling roughly the same, results in an unexpected change in device operation. We have also investigated variations of the coupling circuit. Numerical simulations of the detection circuit enable us to estimate the power output from the array and to optimize the parameters of the system.
Keywords :
coupled circuits; critical currents; microwave oscillators; millimetre wave oscillators; numerical analysis; superconducting device testing; superconducting junction devices; superconducting microwave devices; array coupling; capacitive coupling; coupling circuit; critical current; detection circuit; detector junction; high-frequency properties; junction parasitics; load-coupling circuit; microwave oscillations; numerical simulations; phase-coherent oscillations; power output; resistively shunted Josephson tunnel junctions; system parameters optimization; tunable operation; two-dimensional Josephson junction arrays; Coupling circuits; Critical current; Detectors; Frequency; Inductance; Josephson junctions; Oscillators; Parasitic capacitance; Phased arrays; Sensor arrays;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
