標題: On the origin of photogenerated terahertz radiation from current-biased superconducting YBa2Cu3O7-delta thin films
作者: Lin, PI
Luo, CW
Liu, HS
Chen, SF
Wu, KH
Juang, JY
Uen, TM
Gou, YS
Lin, JY
電子物理學系
物理研究所
Department of Electrophysics
Institute of Physics
公開日期: 15-Jun-2004
摘要: The origin of photogenerated terahertz radiation pulse emitted from current-biased superconducting YBa2Cu3O7-delta thin films excited by femtosecond optical laser pulses is delineated. By investigating the performance of the transient terahertz radiation generated under different operating parameters, pulse reshaping in the measured terahertz electric field caused by the kinetic inductance of the superconducting charge carriers is identified. After recovering the original wave forms of the emitted terahertz pulses, the transient supercurrent density directly correlated to the optically excited quasiparticle dynamics is obtained. A fast decreasing component of about 1.0 ps and a slower recovery process with a value of 2.5 ps are unambiguously delineated in the optically induced supercurrent modulation. The radiation mechanism of the transient terahertz pulse related to nonequilibrium superconductivity is discussed. (C) 2004 American Institute of Physics.
URI: http://dx.doi.org/10.1063/1.1738537
http://hdl.handle.net/11536/26670
ISSN: 0021-8979
DOI: 10.1063/1.1738537
期刊: JOURNAL OF APPLIED PHYSICS
Volume: 95
Issue: 12
起始頁: 8046
結束頁: 8050
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