• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Ultrafast electronics and optoelectronics >Terahertz Emission from YBa_2Cu_3O_7-#delta# thin films
【24h】

Terahertz Emission from YBa_2Cu_3O_7-#delta# thin films

机译：YBa_2Cu_3O_7-＃delta＃薄膜的太赫兹发射

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report the first observation of terahertz emission from unbiased YBa_2Cu_3O_7 thin films at room temperature excited by 1.5 eV femtosecond laser pulses. The strength of the radiated terahertz field depends on the incident angle (#theta#) and depends linearly on incient power. The terahertz emission also depends strongly on the rotation of the film about its surface normal (azimuthal angle, #PHI#). The strong anisotroy, with 4#PHI# symmetry is demonstrated for different polarizations (incident and detected) and found to be consistent with optical rectification. Because YBCO is centrosymmetric, the secord order nonlinear susceptibility vanishes. The next order term in the nonlinear polarizations is the electric quadrupole source term which describes the observed data quite well. The terahertz radiation was found to decrease with decreasing oxygen content, indicating that the carriers in the doped sample enhance the nonlinearity responsible for hte terahertz emission.
机译：我们报告了在室温下由1.5 eV飞秒激光脉冲激发的无偏YBa_2Cu_3O_7薄膜的太赫兹发射的首次观察。辐射的太赫兹场的强度取决于入射角（＃theta＃），并且线性取决于有效功率。太赫兹发射还强烈依赖于薄膜绕其表面法线（方位角，＃PHI＃）的旋转。具有4＃PHI＃对称性的强各向异性被证明适用于不同的偏振（入射和探测），并且与光学整流是一致的。由于YBCO是中心对称的，因此二阶非线性磁化率消失了。非线性极化中的下一个项是电四极子源项，它很好地描述了观测到的数据。发现太赫兹辐射随氧含量的降低而降低，这表明掺杂样品中的载流子增强了负责太赫兹发射的非线性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号