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Frequency following imaging of electric fields from resonant superconducting devices using a scanning near-field microwave microscope

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8 Author(s)
Thanawalla, A.S. ; Dept. of Phys., Maryland Univ., College Park, MD, USA ; Feenstra, B.J. ; Weosheng Hu ; Steinhauer, D.E.
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We have developed a scanning near-field microwave microscope that operates at cryogenic temperatures. Our system uses an open-ended coaxial probe with a 200 /spl mu/m inner conductor diameter and operates from 77 to 300 K in the 0.01-20 GHz frequency range. In this paper, we present microwave images of the electric field distribution above a Tl/sub 2/Ba/sub 2/CaCu/sub 2/O/sub 8/ microstrip resonator at 77 K, measured at several heights. In addition, we describe the use of a frequency-following circuit to study the influence of the probe on the resonant frequency of the device.

Published in:
Applied Superconductivity, IEEE Transactions on  (Volume:9 ,  Issue: 2 )

Date of Publication: June 1999

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