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We report on a class of low temperature radiation detectors based on superconducting tunnel junctions (STJs) in which the incoming radiation is absorbed in a long superconducting strip while the readout operation occurs at the two ends of the strip, where two STJs are laterally positioned. These Distributed Read-Out Imaging Devices, or DROIDs, provide spectroscopy, 1-D imaging, single-photon sensitivity, and high quantum efficiency, all in one device. Typically these devices are realized by using Tantalum for the absorber strip and Aluminum for the two STJs. In this way the quasi-particles are created in the Tantalum and subsequently trapped in the Aluminum. As illustrated here, it is possible to fabricate a DROID using a single superconducting material. This choice gives up the trapping effect but has the advantage of eliminating the interface between different superconducting materials. Such a device combines …
Publication date: 
23 Jul 2007

C Nappi, M Ejrnaes, MP Lisitskiy, D Perez De Lara, E Esposito, S Pagano, R Cristiano

Biblio References: 
Volume: 17 Issue: 2 Pages: 302-305
IEEE transactions on applied superconductivity