Control of gigahertz antenna radiation using optically triggered Y–Ba–Cu–O superconducting microbridges

Ultrafast voltage transients from optically thick YBa2Cu3O7-x (YBCO) microbridges, dc-biased and triggered with femtosecond optical pulses at temperatures below the YBCO critical temperature were used to excite radiation of a transmitting gigahertz-frequency antenna. The shape of the power spectrum...

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Bibliographic Details
Published in:Superconductor science & technology 2004-05, Vol.17 (5), p.S336-S340
Main Authors: Jukna, A, Taneda, T, Sobolewski, Roman
Format: Article
Language:English
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Summary:Ultrafast voltage transients from optically thick YBa2Cu3O7-x (YBCO) microbridges, dc-biased and triggered with femtosecond optical pulses at temperatures below the YBCO critical temperature were used to excite radiation of a transmitting gigahertz-frequency antenna. The shape of the power spectrum of the antenna radiation depended on the time evolution and amplitude of the YBCO photoresponse transient, which was controlled by the incident laser fluence and the microbridge temperature and bias current. The main contribution to the above 10 GHz radiation was attributed to the photoresponse rising edge, generated due to the initial supercurrent redistribution and the kinetic-inductive effect. Low-frequency antenna radiation was excited by the photoresponse component associated with heating and cooling effects generated in the superconducting microbridge. Our antenna radiation approach can be used for time-resolved investigation of electric current distributions in photoactivated YBCO thin films.
ISSN:0953-2048
1361-6668
DOI:10.1088/0953-2048/17/5/049