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When a soliton propagates in a discrete lattice it excites small-amplitudelinear waves in its wake. In a dc current-biased Josephson-junction (JJ) arraythese manifest as electromagnetic (EM) waves excited by a (magnetic fieldinduced) chain of propagating magnetic vortices. When the vortex velocity andthe phase velocity of one of the excited EM waves match, phase-locking occurs.This produces resonant steps in the current-voltage characteristics whereamplification of EM radiation occurs. We report the first observation ofphase-locking-induced amplification of EM radiation at 77K and above in JJarrays made of high temperature superconductors.

Amplification of electromagnetic waves excited by a chain of propagating magnetic vortices in YBaCuO Josephson-junction arrays at 77K and above