Single-slot-dipole Coupled YBCO Josephson Junctions for Terahertz Wave Detectors

In this paper, we propose a terahertz wave detector using a grain boundary Josephson junctions (GBJJs) with a single slot-dipole antenna (SDA). A full-wavelength single SDA structure designed for 220 GHz was patterned with an Au on an YBa2Cu3O7-δ (YBCO) GBJJ covered with an insulating benzocyclobutene (BCB). The current-voltage characteristic of the detector showed clear Shapiro steps for radio frequency wave irradiation at frequencies around the designed one.