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Free-space electrooptic sampling of terahertz radiation from optically excited superconducting YBa2Cu3O7-δ thin films

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6 Author(s)
Po-Iem Lin ; Dept. of Electrophys., Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Wu, K.H. ; Juang, J.Y. ; Lin, J.-Y.
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The characteristics of photogenerated terahertz radiation from a current-biased superconducting YBa2Cu3O7-δ (YBCO) bow-tie antenna were investigated using a free-space electrooptic sampling technique. Picosecond electromagnetic pulses about 450 fs wide were obtained. The frequency spectrum derived by Fourier transforming the picosecond pulses spans over 0.1-4 THz. The dynamics of the quasi-particles optically induced by the ultrafast laser pulse primarily determines the performances of the transient terahertz radiation generated under different operating parameters. The results indicate a characteristic quasi-particle relaxation time of about 2.5 ps close to the critical temperature Tc, and a faster time at lower temperatures.

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Applied Superconductivity, IEEE Transactions on  (Volume:13 ,  Issue: 1 )