INTERACTION OF MICROWAVES WITH POINT-CONTACT JOSEPHSON-JUNCTION ARRAYS.

Dominic J. Repici

Andrew Longacre

P. Russer

C. C. Grimes, P. L. Richards, S. M. Shapiro

We have measured spectral-response curves of superconducting point contacts suggesting the existence of frequency-dependent Josephson current amplitudes peaking in the vicinity of the energy gap. These point-contact Josephson junctions respond sensitively and with high speed to millimeter and submillimeter radiation. Radiation emitted to free space by one such junction was detected by another junction.

Hans Zimmer

Yan Shao-lin

One of the most important problems in the use of Josephson junction arrays as mm/sub-mm microwave sources is the phase locking of the junctions. Using the resistively and capacitively shunted Josephson junction model,we study the phase locking properties of junction arrays shunted by a common resistor. The results include the influence of the parameter spread of the critical current,the McCumber parameter and the number of the junctions on the phase locking properties.