Journal of Low Temperature Physics

, Volume 151, Issue 1, pp 298–303

Direct Position Resolution Measurement with DROIDs at Optical Wavelengths

  • R. A. Hijmering
  • P. Verhoeve
  • D. D. E. Martin
  • I. Jerjen
  • A. G. Kozorezov
  • R. Venn
Article

DOI: 10.1007/s10909-007-9655-8

Cite this article as:
Hijmering, R.A., Verhoeve, P., Martin, D.D.E. et al. J Low Temp Phys (2008) 151: 298. doi:10.1007/s10909-007-9655-8

Abstract

The DROID (Distributed Read-Out Imaging Detector) is being developed to overcome the limitation in sensitive area with the use of single STJ’s (Superconducting Tunnel Junctions). The DROID configuration allows the reconstruction of the position of the photon absorption and therefore it can replace a number of single STJ’s in a detector array. The position resolution dictates how many STJ the DROID can replace.

We present direct measurements of the position resolution in DROIDs, using a 10 µm spot of visible light which illuminates the DROID locally and which is scanned along the absorber length. The DROIDs used for the measurements have 100 nm thick Ta absorber strips with Ta/Al/AlOx/Al/Ta STJ’s on either end. The STJ’s are square with the same size as the absorber width and the base Ta layer are adjacent to the absorber. The position resolution is measured for absorber length ranging from 200 to 400 µm and 30 µm width.

Keywords

STJ DROIDs Strip detectors Superconducting Optical photon detection 

PACS

07.60.-j 85.25.-j 85.25.Am 85.25.Oj 

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • R. A. Hijmering
    • 1
  • P. Verhoeve
    • 1
  • D. D. E. Martin
    • 1
  • I. Jerjen
    • 1
  • A. G. Kozorezov
    • 2
  • R. Venn
    • 3
  1. 1.Science Payload Instrumentation SectionEuropean Space Agency, ESTECNoordwijkThe Netherlands
  2. 2.Department of PhysicsLancaster UniversityLancasterUK
  3. 3.Cambridge MicroFab Ltd.CambridgshireUK