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We have theoretically demonstrated the emission of circularly polarized terahertz (THz) waves from intrinsic Josephson junctions (IJJs), which are locally heated by an external heat source such as laser irradiation. We focus on a mesa-structured IJJ, whose geometry slightly deviates from a square, and find that the local heating makes it possible to emit circularly polarized THz waves. In this mesa, the inhomogeneity of critical current density induced by the local heating excites the electromagnetic cavity modes TM (1,0) and TM (0,1), whose polarizations are orthogonal to each other. The mixture of these modes results in the generation of circularly polarized THz waves. We also show that the circular polarization dramatically changes with the applied voltage. The emitter based on IJJs can emit circularly polarized and continuum THz waves by the local heating and will be useful for various technological applications.

Emission of Circularly Polarized Terahertz Wave From Inhomogeneous Intrinsic Josephson Junctions