Josephson Terahertz local oscillator
Voltage tunable Josephson junction Terahertz oscillators have been fabricated using rugged, high current density NbN/sub 1-x/C/sub x/ tunnel junctions with MgO barriers. The radiation emitted from such junctions is detected on chip by a second Josephson junction which is capacitively coupled to the first. For oscillator junctions with a critical density of J/sub c/ -- 3.5 x 10/sup 4/ A/cm/sup 2/ the authors find that the junction oscillates with a voltage amplitude of -- 1.5 mV. The detected RF voltage level remains essentially constant from 300 GHz. to above 1 THz., the upper limit of the detector. From measurements of the Josephson step height to the detector IV it is determined that the oscillator junction is producing 0.5 ..mu..W of Terahertz radiation of which, due to impedance mismatch, 10 nW is coupled into the detector junction.
- Research Organization:
- 9501221
- OSTI ID:
- 5919085
- Report Number(s):
- CONF-880812-
- Journal Information:
- IEEE Trans. Magn.; (United States), Vol. 25:2; Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GENERAL PHYSICS
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
JOSEPHSON JUNCTIONS
FABRICATION
RADIATION DETECTORS
INTEGRATED CIRCUITS
COUPLING
CURRENT DENSITY
MAGNESIUM OXIDES
NIOBIUM NITRIDES
OSCILLATORS
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
ELECTRONIC CIRCUITS
ELECTRONIC EQUIPMENT
EQUIPMENT
JUNCTIONS
MAGNESIUM COMPOUNDS
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
NIOBIUM COMPOUNDS
NITRIDES
NITROGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PNICTIDES
REFRACTORY METAL COMPOUNDS
SUPERCONDUCTING JUNCTIONS
TRANSITION ELEMENT COMPOUNDS
420201* - Engineering- Cryogenic Equipment & Devices
440100 - Radiation Instrumentation