NDLI: Ultrafast YBCO photodetector based on the kinetic-inductive process

Content Provider	IEEE Xplore Digital Library
Author	Williams, C. Xu, Y. Adam, R. Darula, M. Harnack, O. Scherbel, J. Siegel, M. Hegmann, F.A. Sobolewski, R.
Copyright Year	2002
Abstract	We make use of the nonequilibrium kinetic-inductive effect in epitaxial YBa/sub 2/Cu/sub 3/O/sub 7-x/ (YBCO) thin films to demonstrate an ultrafast, high-sensitivity, broadband photodetector. The photoresponse of a 5-/spl mu/m-wide, 10-/spl mu/m-long, 100-nm-thick YBCO microbridge embedded in a 20-/spl mu/m-wide coplanar strip transmission line was measured using a >1-THz, submillivolt-sensitivity electro-optic sampling system. We performed a comprehensive study of the optical power and wavelength dependency on the YBCO photodetector response. The quantum coherence Rothwarf-Taylor model together with the hot-electron relaxation effect were used to explain the measured data and to extract the number of generated quasiparticles for each absorbed photon, revealing the intrinsic quantum yield of our device to be /spl sim/450. The amplitude, response time, and the intrinsic gain of the YBCO photoresponses were observed to be spectrally flat over the tested range of 390 nm to 810 nm.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	578
Ending Page	581
Page Count	4
File Size	410522
File Format	PDF
ISSN	10518223
Volume Number	11
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2001-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Yttrium barium copper oxide Photodetectors Transmission line measurements Wavelength measurement Transistors Strips Power transmission lines Coplanar transmission lines Sampling methods Optical films
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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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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