论文标题
连贯的声子和声子 - 两极的超快动力学
Ultrafast dynamics of coherent phonons and phonon-polaritons in lithium niobate crystals
论文作者
论文摘要
这项研究研究了使用反射性泵送 - 探针光谱法（linbo $ _ {3} $）中相干声子和声子 - 孔子的超快动力学，并使用25-FS时间分辨率的反射泵探针光谱。除了几种相干的光音子模式外，电磁抽样测量值还探索了3.8和14.9 THz附近的声子 - 抛物性电子模式的共存，这与理论上的声子 - 帕利顿分散曲线相当一致。我们还发现，连贯的光学声子和Phonon-Polariton之间的时间滞后（$δ$ t $ \ $ 0.2 ps）起源于传播Polariton的耦合时间。我们的发现提供了Linbo $ _ {3} $的可能应用，用于带宽大于10 thz的超快电声音子调节器。
This study investigates the ultrafast dynamics of coherent phonons and phonon-polaritons in lithium niobate (LiNbO$_{3}$) crystals using reflective pump-probe spectroscopy with 25-fs time resolution. In addition to several coherent optical phonon modes, the electro-optic sampling measurements explored the coexistence of phonon-polariton E-modes near 3.8 and 14.9 THz, which agrees considerably with the theoretical phonon-polariton dispersion curves. We also discovered that a time lag ($Δ$t $\approx$ 0.2 ps) between the coherent optical phonon and phonon-polariton originates from the coupling time for propagating phonon-polariton. Our findings provide a possible application of LiNbO$_{3}$ for ultrafast electro-optic phonon modulators with bandwidths greater than 10 THz.
