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1 Feb 1975

Volume 26, Issue 3, pp. 73-135

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First evidence for 1−mm wavelength parametric amplification in a Josephson junction microwave source

B. T. Ulrich and M. T. Levinsen

Appl. Phys. Lett. 26, 131 (1975); http://dx.doi.org/10.1063/1.88073 (3 pages) | Cited 2 times

Online Publication Date: 2 September 2008

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Our observation of 1−mm wavelength radiation generated in a cavity containing a Josephson junction provides evidence for a negative effective microwave resistance in the Josephson junction, and for parametric amplification in the reflection mode by the Josephson junction. These parametric oscillations were observed at wavelengths corresponding to cavity resonances between 1.1− and 2−mm wavelength. The frequency of the emitted radiation differed from the frequency given by ν=2eV/h, and thus the radiation was not simply from the ac Josephson effect. We develop a theory that predicts a negative microwave resistance at junction bias voltages just below a cavity−induced step for resistively shunted junction, and just above the cavity−induced step for a junction with sufficient shunt capacitance. Our observations are consistent with the theory.
Show PACS
84.40.Dc Microwave circuits
85.25.-j Superconducting devices
85.25.Dq Superconducting quantum interference devices (SQUIDs)

Cadmium arsenide thin−film dynamic pressure sensor

W. Włodarski

Appl. Phys. Lett. 26, 133 (1975); http://dx.doi.org/10.1063/1.88074 (3 pages) | Cited 3 times

Online Publication Date: 2 September 2008

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Results are presented of studies on the application of Cd3As2 thin films to measurements of dynamic pressures up to 600 atm in liquid nonconducting media. A comparison is made between this sensor and the quartz pressure sensor in measuring dynamic pressures. The dynamic error involved in measuring pressure with a cadmium arsenide thin−film resistance sensor has been determined as less than 1.5%.
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07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
62.10.+s Mechanical properties of liquids
73.61.Cw Elemental semiconductors
73.61.Ey III-V semiconductors
73.61.Ga II-VI semiconductors
73.61.Jc Amorphous semiconductors; glasses
73.61.Le Other inorganic semiconductors
85.30.-z Semiconductor devices
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