Cavity mode identification for coherent terahertz emission from a nearly square stack of intrinsic Josephson junctions

M. Tsujimoto, I. Kakeya, T. Kashiwagi +2

Stacks of intrinsic Josephson junctions in Bi${}_2$Sr${}_2$CaCu${}_2$O${}_{8+\delta }$ emit intense and coherent terahertz waves determined by the internal electromagnetic cavity resonance. We i…