Journal ArticleDOI
Niobium point-contact Josephson-junction behavior at 604 GHz
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TLDR
In this paper, the ac Josephson effect in Nb point contacts at 604 GHz (496 μm) was measured and the coupling of the far-infrared radiation to the point contact was found to depend in a simple manner on the resistance of the contact.Abstract:
We have measured the ac Josephson effect in Nb point contacts at 604 GHz (496 μm). We find the coupling of the far‐infrared radiation to the point contact to depend in a simple manner on the resistance of the contact. The behavior of the high‐resistance point contacts (50⩽R⩽200 Ω) is very reproducible, allowing a quantitative comparison of the data to the frequency‐dependent Werthamer theory. We also account for the effects of noise and heating and compare these to Tinkham’s heating theory.read more
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Journal ArticleDOI
Fabrication of thin‐film metal nanobridges
TL;DR: In this paper, thin-film fabrication techniques for forming three-dimensional point contacts are presented, and as-fabricated nanobridges can be modified using electromigration to make the constriction region smaller or dirtier.
Journal ArticleDOI
Picosecond applications of Josephson junctions
TL;DR: In this article, the behavior of simple superconducting circuits in the picosecond regime is described in a comprehensive way, with primary emphasis being given to the step function and pulse responses of these circuits.
Journal ArticleDOI
Characterization of niobium point contacts showing Josephson effects in the far infrared
TL;DR: In this paper, the ac Josephson effect has a strong correlation with the gap-related structure on the I•V curve, but none at all with the apparent excess current observed in all the contacts.
Journal ArticleDOI
Point‐contact Josephson mixers at 130 GHz
J. H. Claassen,Paul L. Richards +1 more
TL;DR: In this paper, the properties of pointcontact Josephson junctions operated as mixers with an external local oscillator at 130 GHz have been studied, and the results compared with predictions of the resistively shunted junction model.
Journal ArticleDOI
ac Josephson effect in small‐area superconducting tunnel junctions at 604 GHz
TL;DR: In this article, the ac Josephson effect in small area superconducting tunnel junctions at 604 GHz (λ=496 μm) was measured using a resonant planar dipole antenna to couple the radiation into the junction.
References
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Journal ArticleDOI
Nonlinear self-coupling of Josephson radiation in superconducting tunnel junctions
TL;DR: In this paper, a study of the nonlinear feedback of the ac tunnelling current (first pointed out by Josephson) in a superconducting tunnel junction via the electromagnetic fields radiated by the current into the resonant mode structure of the junction is made.
Journal ArticleDOI
Influence of Microwave Radiation on Current‐Voltage Characteristic of Superconducting Weak Links
TL;DR: In this paper, the currentvoltage characteristics of microwave-irradiated superconducting weak links have been calculated on the analog computer and the results of several authors can be interpreted correctly by taking into consideration the resistive feedback.
Journal ArticleDOI
Improved coupling to infrared whisker diodes by use of antenna theory
L. M. Matarrese,K. M. Evenson +1 more
TL;DR: In this article, it was shown that the dependence of the output of a whisker diode on its orientation in the polarized beam of an infrared laser can be explained on the basis of simple long-wire antenna theory.
Journal ArticleDOI
Efficient high‐power operation of the cw far‐infrared waveguide laser
D. Hodges,F. B. Foote,R. D. Reel +2 more
TL;DR: In this article, an order-of-magnitude increase in output power and efficiency was obtained from optically pumped FIR lasers using a new FIR waveguide laser geometry and a new output coupler.
Journal ArticleDOI
Modulated submillimeter laser interferometer system for plasma density measurements.
TL;DR: A high resolution submillimeter interferometer system for measurement of electron densities in the 10(14)-cm(-3) <= n(e)