- Conference date: 20–24 July 2009
- Location: Stanford (California)
We describe the next generation of our Distributed Read‐Out Imaging X‐ray Detectors based on superconducting tunnel junctions (STJs). Various shapes of the readout STJs and sizes of absorbers are compared with a view to optimizing the sensitive area and fill factor of future arrays while maintaining good energy resolution. Also different absorber configurations will be explored: the traditional integrated absorber is compared with an absorber deposited after definition of the read‐out structures. In support of this work, the feasibility of Re as an absorber is demonstrated with the detection of single UV photons in a Re/Al STJ. In addition, our tunnel barriers have successfully been made more transparent without loss of their low leakage properties. Finally, Nb contacts which prevent quasiparticles from escaping the STJs are identified as a source of device to device variability in the performance.
- Josephson junctions
- Image sensors
- Superconducting detectors
- Collective excitations
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