Resonant terahertz radiation from Tl2Ba2CaCu2O8+δ thin films by ultrafast optical pulse excitation
Resonant terahertz radiation from Tl2Ba2CaCu2O8+δ thin films by ultrafast optical pulse excitation
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超快光脉冲激发 Tl2Ba2CaCu2O8+δ 薄膜的谐振太赫兹辐射
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发表时间：
2002
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通讯作者：
H. Schneidewind
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作者：
Y. Tominari;T. Kiwa;H. Murakami;M. Tonouchi;H. Wald;P. Seidel;H. Schneidewind
我们通过飞秒光脉冲激励，在接近平行于薄膜c轴的约100 Oe的径向磁场下，观察到c轴取向的Tl2Ba2CaCu2O8+δ薄膜的谐振太赫兹波的自由空间辐射。观察到的波形显示出高达 80 K 的清晰振荡。频率从 24 K 时的 ∼620 GHz 转移到 80 K 时的 ∼300 GHz，对应于 c 轴穿透深度 λc 从 ∼26 μm 到 ∼53 μm 的增加，并且如约瑟夫森等离子体共振所预期的那样，在 TC 之上消失。
We have observed the free-space radiation of the resonant terahertz wave from c-axis oriented Tl2Ba2CaCu2O8+δ thin films by femtosecond optical pulse excitation under a radial magnetic field of about 100 Oe nearly parallel to the c axis of the thin film. The observed wave form showed clear oscillations up to 80 K. The frequency was shifted from ∼620 GHz at 24 K to ∼300 GHz at 80 K, corresponding to an increase in c-axis penetration depth, λc, from ∼26 μm to ∼53 μm, and disappeared above TC as expected for the Josephson plasma resonance.