DocumentCode
1242887
Title
THz radiation properties of Tl2Ba2CaCu2O8+δ thin films excited by femtosecond laser pulses
Author
Tominari, Yukihiro ; Kiwa, Toshihiko ; Murakami, Hironaru ; Tonouchi, Masayoshi ; Schneidewind, Henrik ; Wald, Hagen ; Seidel, Paul
Author_Institution
Res. Center for Supercond. Photonics, Osaka Univ., Japan
Volume
13
Issue
2
fYear
2003
fDate
6/1/2003 12:00:00 AM
Firstpage
3730
Lastpage
3733
Abstract
Previously, we found the resonant THz wave radiation from c-axis oriented underdoped Tl2Ba2CaCu2O8+δ (Tl-2212) thin films by femtosecond laser pulse illumination under magnetic field. The properties of the resonant THz wave were well explained by the Josephson plasma resonance phenomenon. In the present study, the THz radiation properties were investigated for an overdoped Tl-2212 thin films. The amplitudes of THz waveform radiated under a bias current condition is much smaller than those of previous sample, while any trace of resonant THz signals could not be observed under magnetic field. These experimental results indicate the possibility that the initial THz wave radiated by ultrafast modulation in eddy-current around the vortices has an important role to excite the collective mode oscillation.
Keywords
Josephson effect; barium compounds; calcium compounds; high-temperature superconductors; laser beam effects; superconducting thin films; thallium compounds; Josephson plasma resonance phenomenon; THz radiation properties; Tl2Ba2CaCu2O8+δ; Tl2Ba2CaCu2O8+δ thin films; bias current condition; collective mode oscillation; eddy-current; femtosecond laser pulses; high temperature superconductor; Laser excitation; Lighting; Magnetic fields; Magnetic films; Magnetic resonance; Optical pulses; Plasma properties; Sputtering; Transistors; Ultrafast optics;
fLanguage
English
Journal_Title
Applied Superconductivity, IEEE Transactions on
Publisher
ieee
ISSN
1051-8223
Type
jour
DOI
10.1109/TASC.2003.812529
Filename
1212439
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