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We present a mechanism for emission of electromagnetic terahertz waves bysimulation. High $T_{c}$ superconductors form naturally stacked Josephsonjunctions. When an external current and a magnetic field are applied to thesample, fluxon flow induces voltage. The voltage creates oscillating currentthrough the Josephson effect and the current excites the Josephson plasma. Thesample works as a cavity, and the input energy is stored in a form of standingwave of the Josephson plasma. A part of the energy is emitted as terahertzwaves.Comment: 4 pages, 5 figure

Emission of continuous coherent terahertz waves with tunable frequency by intrinsic Josephson junctions