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9 Apr 2012

Volume 100, Issue 15, Articles (15xxxx)

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Appl. Phys. Lett. 100, 153701 (2012); http://dx.doi.org/10.1063/1.3700446 (3 pages)

Hsiao-lu D. Lee, Steffen J. Sahl, Matthew D. Lew, and W. E. Moerner
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Microstrip direct current superconducting quantum interference device radio frequency amplifier: Noise data

Bernd Schmidt and Michael Mück

Appl. Phys. Lett. 100, 152601 (2012); http://dx.doi.org/10.1063/1.3702825 (4 pages)

Online Publication Date: 9 April 2012

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A series of about twenty superconducting quantum interference devices (SQUIDs) has been operated as microstrip-SQUID amplifiers (MSAs) at frequencies ranging from 100 MHz to 2 GHz to study the dependence of their gain and noise temperature on bias current and flux. The measured values were in good agreement with theory. The observed dependence of MSA gain and noise temperature on bias current and flux resembled the static transfer function of the SQUIDs. The gains are relatively insensitive to changes in bias current and bias flux; the noise temperature is strongly dependent on the bias flux.
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85.25.Dq Superconducting quantum interference devices (SQUIDs)
84.30.Le Amplifiers

Timing performance of 30-nm-wide superconducting nanowire avalanche photodetectors

F. Najafi, F. Marsili, E. Dauler, R. J. Molnar, and K. K. Berggren

Appl. Phys. Lett. 100, 152602 (2012); http://dx.doi.org/10.1063/1.3703588 (4 pages) | Cited 2 times

Online Publication Date: 12 April 2012

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We investigated the timing jitter of superconducting nanowire avalanche photodetectors (SNAPs, also referred to as cascade-switching superconducting single-photon detectors) based on 30-nm-wide nanowires. At bias currents (IB) near the switching current, SNAPs showed sub-35-ps FWHM Gaussian jitter similar to standard 100-nm-wide superconducting nanowire single-photon detectors. At lower values of IB, the instrument response function (IRF) of the detectors became wider, more asymmetric, and shifted to longer time delays. We could reproduce the experimentally observed IRF time-shift in simulations based on an electrothermal model and explain the effect with a simple physical picture.
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85.25.Oj Superconducting optical, X-ray, and γ-ray detectors (SIS, NIS, transition edge)
85.60.Dw Photodiodes; phototransistors; photoresistors
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