On the origin of photogenerated terahertz radiation from current-biased superconducting YBa2Cu3O7-δ thin films

Po Lem Lin*, Chih-Wei Luo, Hsin Shan Liu, Shyh Feng Chen, Kaung-Hsiung Wu, Jenh-Yih Juang, Tseng Ming Uen, Yih Shung Gou, Jiunn-Yuan Lin

*此作品的通信作者

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

The origin of photogenerated terahertz radiation pulse emitted from current-biased superconducting YBa2Cu3O72d 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.

原文English
頁(從 - 到)8046-8050
頁數5
期刊Journal of Applied Physics
95
發行號12
DOIs
出版狀態Published - 15 6月 2004

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