Title :
Optical response of highly oriented YBCO thin films
Author_Institution :
Dept. of Electr. & Comput. Eng., Colorado Univ., Boulder, CO, USA
fDate :
3/1/1991 12:00:00 AM
Abstract :
A thin-film transition edge bolometer was fabricated from laser ablated YBCO. The response to chopped 633-nm radiation was measured as a function of temperature, optical intensity, bias current, and signal frequency. At a chopping frequency of 1 Hz and a bias current of 100 μA, the responsivity was 10 V/W and the noise power was 39 nW/√Hz. At low frequencies the device showed all the characteristics of a bolometer. At higher frequencies, however, an additional component of the photo response was found. The magnitude of this component scales roughly like f-0.5. This additional response is thought to be caused by optically induced depinning of vortices
Keywords :
barium compounds; bolometers; high-temperature superconductors; superconducting thin films; yttrium compounds; 1 Hz; 100 muA; 633 nm; YBa2Cu3Ox; bias current; chopped 633-nm radiation; chopping frequency; high temperature superconductors; noise power; optical intensity; optically induced depinning of vortices; photo response; responsivity; signal frequency; temperature; thin-film transition edge bolometer; Bolometers; Current measurement; Frequency; Laser noise; Laser transitions; Optical films; Optical noise; Optical vortices; Transistors; Yttrium barium copper oxide;
Journal_Title :
Magnetics, IEEE Transactions on
