arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.03929physics.opticsphysics.app-ph
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LiNbO $_3$中声子极化激元太赫兹电场的选择性成像

Selective imaging of terahertz electric field of phonon-polariton in LiNbO$_3$

Keita Matsumoto, Takuya Satoh

摘要:

相干声子-极化激元由于与非线性光学和太赫兹(THz)辐射的相关性而吸引了相当大的兴趣。因此,研究声子极化激元的太赫兹电场具有重要意义。然而,在以前的大多数测量中,仅检测到THz电场的单个分量。在本文中,我们表明,泵浦探测电光成像测量使用的斯托克斯参数的探测偏振,使相位分辨的选择性检测太赫兹电场分量与声子极化激元。实验上区分了寻常声子极化激元和非寻常声子极化激元的模式分布,阐明了激发机制为光整流。这些结果解释了太赫兹电场的麦克斯韦方程组的数值计算。选择性地观测太赫兹电场分量的技术可能有助于设计高效的太赫兹波发射器。

英文摘要:

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.

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