Title :
Large Signal Amplitude and Bias Range of Cascade Switch Superconducting Nanowire Single Photon Detectors
Author :
Ejrnaes, Mikkel ; Casaburi, Alessandro ; Quaranta, Orlando ; Marchetti, Stefania ; Gaggero, Alessandro ; Mattioli, Francesco ; Leoni, Roberto ; Pagano, Sergio ; Cristiano, Roberto
Author_Institution :
C.N.R.-Inst. of Cybern., Pozzuoli, Italy
fDate :
6/1/2009 12:00:00 AM
Abstract :
Cascade switch superconducting nanowire single photon detectors has been fabricated of ultrathin NbN films deposited by DC-magnetron sputtering at room temperature on MgO substrates. Detectors using 4 to 24 nanowires in parallel, having an area coverage of 5times mum2 and a filling factor of 40%, have been investigated. Signal amplitudes increase with the number of parallel nanowires and reaches 12.3 mV with a signal noise of 20 muV. The range of bias currents where the detectors emit signal pulses also increase with the number of parallel nanowires and exceeds the nanowire critical current.
Keywords :
critical current density (superconductivity); nanowires; sputtering; superconducting photodetectors; superconducting switches; DC-magnetron sputtering; MgO; NbN; cascade switch superconducting detector; large signal amplitude; nanowire critical current; nanowire single photon detector; parallel nanowires; signal noise; temperature 293 K to 298 K; ultrathin film; voltage 12.3 mV; voltage 20 muV; Infrared detectors; nanotechnology; superconducting radiation detectors; thin films;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2009.2019034
