论文标题
高阶谐波产生砷化甘氨酸的极化光谱法
Polarization Spectroscopy of High-Order Harmonic Generation in Gallium Arsenide
论文作者
论文摘要
固体中高谐波产生的一个有趣的特性是其激光偏振性质，这又提供了有关生成介质的晶体和条带结构的信息。在这里，我们报告了从砷耐晶层的高阶谐波产生的线性极化依赖性。有趣的是，我们观察到上述带隙谐波随激光强度的函数的各向异性响应的显着演变。我们将这种变化归因于发射过程的基本显微镜效应，该过程包括内部和带动力学之间的竞争。生成过程的各向异性性质的强度依赖性提供了沿晶体的首选方向驱动和控制电子电流的可能性，并且可以在整合的全稳态PETAHERTZ光电设备中充当开关技术。
An interesting property of high harmonic generation in solids is its laser polarization dependent nature which in turn provides information about the crystal and band structure of the generation medium. Here we report on the linear polarization dependence of high-order harmonic generation from a gallium arsenide crystal. Interestingly, we observe a significant evolution of the anisotropic response of above bandgap harmonics as a function of the laser intensity. We attribute this change to fundamental microscopic effects of the emission process comprising a competition between intraband and interband dynamics. This intensity dependence of the anisotropic nature of the generation process offers the possibility to drive and control the electron current along preferred directions of the crystal, and could serve as a switching technique in an integrated all-solid-state petahertz optoelectronic device.
