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Fabrication of Slot-Antenna-Coupled BSCCO Intrinsic Josephson Junctions
Takashi Uchida,Noboru Kawai,Takashi Tachiki 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.5I
Coupling intrinsic Josephson junctions with a thin-.lm antenna is an eective method for realizing sensitive detectors and high-power oscillators in the millimeter- and submillimeter- wavelength regions. We investigated using a slot antenna as a thin-.lm antenna and fabricated slot-antenna-coupled Bi2Sr2CaCu2O8+x intrinsic Josephson junctions for 100 GHz millimeter waves. The antenna structure was designed for coupling the antenna ground plane with intrinsic Josephson junctions of a four-terminal con.guration. The ground plane of the antenna also acts as an electrode. Therefore, the ground plane was divided into four electrodes by making four DC cuts and extended electrodes were used to connect the electrodes to intrinsic Josephson junctions. Then, slot-antenna-coupled intrinsic Josephson junctions were fabricated on MgO substrates. The antenna ground plane consisted of a Au .lm. The current-voltage characteristics of the intrinsic Josephson junctions exhibited resistive branches with the critical current of about 1.5 mA at 20 K. Operation of the antenna was con.rmed on the basis of the dierence of 7.8 dB in the irradiation power when the critical current started to be suppressed between the cases with the incident electric .eld respectively parallel and perpendicular to the E-plane of the antenna.