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Shunted Josephson Junctions and Optimization of Niobium Integrated Matching Circuits
- Source :
- IEEE Transactions on Applied Superconductivity. 32:1-5
- Publication Year :
- 2022
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2022.
-
Abstract
- Josephson junctions (JJs) with non-hysteretic I-V characteristic and high critical parameters are required for many applications; in particular, they are needed to create tunable THz range oscillators. We fabricated and studied shunted superconductor-insulator-superconductor (SIS) Nb-AlOx-Nb tunnel junctions with an area of about 1m2, estimated their parameters, and compared them with theoretical models. To assess the performance of shunted junctions in the terahertz range, their characteristics were studied under the influence of a high-frequency signal; the estimated value of the characteristic voltage for the shunted junction at a high frequency is about 1 mV. To improve the circuit parameters, a new type of the shunting based on application of NIS junctions was proposed, which reduces the influence of parasitic inductance, expands the frequency range of the generator, and decreases the size of the structure. The JJs with a new type of shunting have been fabricated and studied. The niobium integrated circuits intended for matching the superconducting oscillator and an SIS junction as a microwave detector were designed, fabricated, and tested. Such structures are required for studying the spectral characteristics and analyzing the operation of the oscillator. The developed circuits have demonstrated efficient operation at frequencies from 300 to 700 GHz; the experimental results are in good agreement with the simulated characteristics. The results obtained will be implemented for further development of the THz range oscillators.
- Subjects :
- Josephson effect
Materials science
business.industry
Terahertz radiation
Detector
Integrated circuit
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
law.invention
law
Condensed Matter::Superconductivity
Parasitic element
Optoelectronics
Electrical and Electronic Engineering
business
Microwave
Voltage
Electronic circuit
Subjects
Details
- ISSN :
- 23787074 and 10518223
- Volume :
- 32
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Applied Superconductivity
- Accession number :
- edsair.doi...........b4ac3f01b4f51c0127098305df829044