具有集成金属太赫兹腔体的Spintronic太赫兹发射器
Martin Mičica1, Adrien Wright1, Pierre Koleják2,3
1Laboratoire de Physique de l'Ecole Normale Supérieure, ENS, Université PSL, CNRS, Sorbonne Université, Université Paris Cité, F-75005, Paris, France.
Nanophotonics (Berlin, Germany)
|December 5, 2024
概括
研究人员通过将它们集成到THz共振腔中,增强了来自自旋式太赫兹发射器 (STEs) 的太赫兹 (THz) 脉冲生成. 这种方法有效地增加了THz场强度的两倍,提高了各种应用的效率.
科学领域:
- 固态物理 固态物理
- 太赫兹 (THz) 光子学
- 这就是Spintronics.
背景情况:
- 螺旋式太赫兹发射器 (STEs) 对于通过光学激发铁磁/重金属 (FM/HM) 异质连接来产生THz脉冲至关重要.
- 目前在STEs中的光学到THz转换效率有限,尽管光学吸收增强技术的进步.
- 为了提高STE效率,THz腔的应用尚未被研究过.
研究的目的:
- 为了提高特拉赫兹 (THz) 发射效率,在特定的THz光谱范围内使用自旋式特拉赫兹发射器 (STEs).
- 探索THz共振腔的使用,以改善来自FM/HM异构的THz生成.
主要方法:
- 在超薄的蓝宝石层上制造FM / HM结构,并用金属镜子覆盖,以形成lambda / 4 THz共振腔.
- 利用THz发射时间域光谱在STE/蓝宝石/镜子异构结构上,其蓝宝石厚度各不相同 (110微米至25微米).
- 执行时间模拟以建模发射的THz脉冲并验证实验结果.
主要成果:
- 观察到发射THz场的显著增强,与lambda/4腔共振相一致.
- 在目标光谱范围内达到THz场强度的翻倍.
- 通过使用双折断材料,证明了对发射THz脉冲的极化状态的控制.
结论:
- 整合THz腔提供了一个可行的策略,用于增强和工程STEs的THz排放.
- 开发的基于腔的方法允许在广泛范围内进行光谱控制,并且可以与光学腔相结合.
- 这项工作为基于自旋电子原理的更高效和可调节的THz源铺平了道路.
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