五秒激光诱导的从鲁薄膜发出的一致的特拉赫兹脉冲的发射
Lorenzo Cruciani1,2, Stefan van Vliet1, Alessandro Troglia1
1Advanced Research Center for Nanolithography, Science Park 106, 1098 XG Amsterdam, The Netherlands.
The journal of physical chemistry. C, Nanomaterials and interfaces
|December 1, 2023
概括
薄膜通过非线性光学发射太赫兹 (THz) 的电磁脉冲. 基质选择和氧化显著影响THz发射特性和极化.
科学领域:
- 材料科学 材料科学 材料科学
- 光学是什么?光学是什么?光学是什么?
- 凝聚物质物理学 凝聚物质物理学
背景情况:
- 来自金属表面的太赫兹 (THz) 波产生是一个活跃的研究领域.
- 非线性光学过程为THz发射提供了途径.
- 了解材料特性和接口的影响对于控制THz生成至关重要.
研究的目的:
- 为了研究来自 (Ru) 薄膜的太赫兹 (THz) 电磁脉冲辐射.
- 探索不同基质和氧化状态对THz排放特性的影响.
- 为了将THz排放特征与表面特性和氧化水平相关联.
主要方法:
- 在各种基板 (玻璃,蓝宝石,CaF2) 上制造薄膜.
- 使用光学探针光谱学对THz辐射的表征.
- 通过激光诱导和热氧化过程对氧化效应的研究.
- 分析THz电场振幅,极化和功率依赖.
主要成果:
- 薄膜通过第二阶非线性光学过程显示THz发射.
- THz的发射特性,包括极化和电源依赖性,随着基质的不同而有很大变化.
- 在功率值以上的Ru/玻璃上,激光诱导的氧化会增加THz电场振幅与功率的斜率.
- 热氧化增强了Ru/蓝宝石和Ru/CaF2的THz排放,引入了额外的极化元件.
- 观察到THz发射强度和氧化程度之间存在很强的相关性.
结论:
- 基板和表面的化学成分对薄膜的THz辐射具有关键的影响.
- 氧化在调节THz发射强度和极化方面发挥着关键作用.
- 精确了解样本表面状态对于解释金属表面THz排放实验至关重要.
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