文章基本信息

标题：Terahertz-assisted even harmonics generation in silicon
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作者：Yingying Ding ; Yushan Zeng ; Xieqiu Yu 等
期刊名称：iScience
印刷版ISSN：2589-0042
出版年度：2022
卷号：25
期号：2
页码：1-12
DOI：10.1016/j.isci.2022.103750
语种：English
出版社：Elsevier
摘要：SummaryWhen a biased electric/light field is applied to centrosymmetric crystals like silicon, the broken symmetry creates even-order harmonics radiation which can reveal key insights into the material. Recently, the second harmonic has been generated by THz-induced symmetry breaking, but the observation of higher-order radiation remains largely unexplored. Here, we demonstrate picosecond-level ultrafast, nondestructive symmetry manipulation of silicon crystal by using a 500 kV/cm intense terahertz (THz) electric field. The THz-induced fourth harmonic of the infrared probe is also observed and characterized for the first time. In addition, we find that the even-order harmonics show no dependence on the THz field direction thus it allows for sub-cycle symmetry manipulations. Our study paves the way toward ultrafast all-optical crystal symmetry control in the future high-speed electronics and photonics.Graphical abstractDisplay OmittedHighlights•THz-assisted even harmonics generation in Si is observed and characterized•Ultrafast symmetry control of centrosymmetric crystal Si is demonstrated•Effect of THz and Si orientation on even harmonics generation is revealed