论文标题
Terahertz电场的选择性成像linbo $ _3 $
Selective imaging of terahertz electric field of phonon-polariton in LiNbO$_3$
论文作者
论文摘要
连贯的声子孔子与非线性光学和Terahertz（THZ）波排放有关，引起了极大的兴趣。因此，重要的是要分析声子 - 两极的THZ电场。但是，在以前的大多数测量值中，仅检测到THZ电场的单个成分。在本文中，我们证明了使用探针极化的Stokes参数的泵探针电光成像测量值可以使与Polyon-Polariton相关的THZ电场组件的相分辨选择性检测。我们在实验上区分了普通和非凡的声子核酸元的模式曲线，并将激发机理阐明为光学整流。这些结果通过对THZ电场的Maxwell方程的数值计算来解释。选择性观察THZ电场成分的技术可能对设计有效的THZ波发射器有用。
Coherent phonon-polaritons have attracted a considerable amount of interest owing to their relevance to nonlinear optics and terahertz (THz)-wave emissions. Therefore, it is important to analyze the THz electric-fields of phonon-polaritons. However, in the majority of previous measurements, only a single component of the THz electric field was detected. In this paper, we demonstrate that pump-probe electro-optical imaging measurements using the Stokes parameters of probe polarization enable the phase-resolved selective detection of THz electric-field components that are associated with the phonon-polariton. We experimentally distinguish the mode profiles of ordinary and extraordinary phonon-polaritons, and clarify the excitation mechanism as optical rectification. These results are explained by numerical calculations of Maxwell equations for the THz electric field. The technique of selectively observing the THz electric field components may be useful for designing efficient THz-wave emitters.
