Numerical simulation of THz emission from two mesa-structured intrinsic Josephson junctions

In this study, we have numerically investigated the radiation from two separated mesa-structured intrinsic Josephson junctions(IJJs)whichareelectricallyconnectedinseries.Wehavecalculatedelectromagneticfield insideandoutside of IJJs simultaneously using two dimensional model. The radiation power has been calculated as a function of the distance between two mesas. We have observed the oscillation of the radiation power with respect to the distance coming from the change of electromagnetic interaction between the mesas. In particular, at the distances where the electromagnetic standing waves appear in the interspace between the mesas, the radiation powers become larger than twicethe poweremitted by oneisolatedmesa. We have also calculatedthe radiationpatternsemitted by two mesas and found thattheradiation patterns greatly changewith the distances.