Terahertz radiation from superconducting YBa2Cu3O7−δ thin films excited by femtosecond optical pulses
- 30 September 1996
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 69 (14) , 2122-2124
- https://doi.org/10.1063/1.117175
Abstract
Ultrashort electromagnetic waves (600 fs width) from superconducting YBCO thin films have been observed by irradiating current-biased samples with femtosecond optical laser pulses (80 fs width). The Fourier component of the pulse extends up to ∼2 THz. The characteristics of the radiation are studied and the radiation mechanism is ascribed to the ultrafast supercurrent modulation by the laser pulses, which induce the nonequilibrium superconductivity.Keywords
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