Microwave electric-field imaging using a high-Tc scanning superconducting quantum interference device

We have used a 77 K thin-film YBa2Cu3O7 superconducting quantum interference device (SQUID) in a scanning SQUID microscope to image room-temperature sources of high-frequency electric field. We find that time-varying electric fields capacitively induce currents in the SQUID, which in turn are rectif...

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Bibliographic Details
Published in:Applied physics letters 1998-08, Vol.73 (7), p.984-986
Main Authors: Chatraphorn, S., Fleet, E. F., Black, R. C., Wellstood, F. C.
Format: Article
Language:English
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Summary:We have used a 77 K thin-film YBa2Cu3O7 superconducting quantum interference device (SQUID) in a scanning SQUID microscope to image room-temperature sources of high-frequency electric field. We find that time-varying electric fields capacitively induce currents in the SQUID, which in turn are rectified by the nonlinearity of the SQUID current–voltage characteristics, leading to changes in the quasistatic voltage across the SQUID. By observing changes in the voltage modulation depth ΔV of the SQUID as a sample is scanned past the SQUID, we obtain electric-field images in the 1–15 GHz frequency range with a SQUID-to-sample separation of about 80 μm.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.122060