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Kinetic-inductance-limited reset time of superconducting nanowire photon counters
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematic of the experimental setup. (a) A cryogenic probing station allowed us to probe our devices both electrically and optically. Our samples were in size, and typically contained from 50–150 individual, separately addressable detectors. (b) A scanning electron microscope image of the electron-beam resist pattern used to define a large-area meander structure.9,10

Image of FIG. 2.
FIG. 2.

(Color online) Inductance-limited recovery of NbN nanowires. Output pulses are shown for wide wires at , with , and dimensions: (a) meander (total length ); (b) ; (c) ; and (d) long single wire. Red dotted lines show the predicted pulse recovery, with no free parameters, for each device based on its measured inductance: , , , and . These predictions include the effect of the measured and corner frequencies of our amplifiers, and the assumptions: , , and (the pulse risetime is then determined by ); and (e) electrical model; photon absorption corresponds to the switch opening, after which the detector current goes nearly to zero, and is diverted into the load. The wire then becomes superconducting again, and the current resets in a time . (f) Inductance at vs room-temperature resistance for 290 individual nanowires from long and wide, with both straight and meander geometries, from two separate samples made in separate fabrication runs. Points corresponding to the devices of (a)–(d) are indicated. The slope of a linear fit constrained to pass through the origin, shown by a solid line, is ; this indicates that , and therefore that is predominantly a kinetic inductance.

Image of FIG. 3.
FIG. 3.

(Color online) Recovery of the detection efficiency after a detection event. (a) Filled circles are data obtained with a meander with wide wire and a 50% fill factor, open circles indicate a device of the same size but with a 25% fill factor. Solid curves are the predictions of our model with no free parameters, obtained as illustrated in (b) and (c) for the 50% fill device, based on the measured inductances22 [ and at ] and detection efficiency vs curves.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Kinetic-inductance-limited reset time of superconducting nanowire photon counters