NDLI: Tantalum STJ for photon counting detectors

Content Provider	IEEE Xplore Digital Library
Author	Jorel, C. Feautrier, P. Villegier, J.-C.
Copyright Year	2002
Abstract	Superconducting Tunnel Junctions (STJ's) are currently being developed as photon detectors for a wide range of applications. These detectors are used because they are energy resolving photon counters, and they can be used from the infrared (2 /spl mu/m) to X-ray wavelengths with good quantum efficiency (80%). At visible wavelengths, the spectral resolution of STJ's can exceed one part in ten. The goal of this work is to develop STJ's for use in low-light astronomical applications in the near infrared. This work emphasizes two points: improvement of the epitaxial tantalum absorber and the development of a new fabrication process for Ta/Al-AlOx-Al/Ta STJ's. The main features of this process are that pixels have aligned electrodes and vias patterned through a protecting SiO/sub 2/ layer. These vias are used to contact the top electrode layer of the STJ. The AlOx tunnel barrier has symmetric Al-Ta trap layers on either side. The 150 nm thick Ta absorber is epitaxially grown on top of a thin Nb seed layer. Photon counting experiments with theses devices are presented at /spl lambda/=0.78 /spl mu/m. Digital filtering methods are used to compute the photon counting data in order to minimize noise.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	587
Ending Page	590
Page Count	4
File Size	525422
File Format	PDF
ISSN	10518223
Volume Number	15
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Infrared detectors Energy resolution Electrodes Superconducting epitaxial layers Superconducting photodetectors Josephson junctions X-ray detection X-ray detectors Counting circuits Fabrication tantalum Astronomy epitaxial layers near infrared photon counting STJ
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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