一维光子晶体结构增强的外部无磁场的自旋式特拉赫兹高场发射器
Zehao Yang1,2,3, Jiahui Li4,5, Shaojie Liu6
1Hangzhou International Innovation Institute, Beihang University, Hangzhou, China.
Science and technology of advanced materials
|March 26, 2025
概括
研究人员使用优化的基板和光子晶体开发了无外部磁场的自旋式太赫兹 (THz) 发射器. 这一突破使得强烈的THz辐射可用于先进的应用,而无需复杂的磁场要求.
科学领域:
- 物理 物理学 物理
- 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?
背景情况:
- 强烈的太赫兹 (THz) 辐射具有多种应用,包括电子加速和材料分析.
- 由于其多功能性,Spintronic THz发射器 (STEs) 是一个有前途的强THz源.
- 传统的STEs (例如,W PaddyCoFeB PaddyPt) 需要外部磁场,限制可扩展性和统一的THz场生成.
研究的目的:
- 从没有外部磁场的STEs开发高场THz辐射.
- 通过基板优化和光子晶体集成来提高THz辐射效率.
- 克服传统磁场依赖性STEs的局限性.
主要方法:
- 制造IrMn和CoFeB和FeBW三层异构结构.
- 优化基板的导热能力.
- 整合一个一维的光子晶体 (PC) 结构.
- 使用Ti:蓝宝石五秒激光放大器 (800 nm,35 fs,5.5 mJ在1 kHz) 的激发.
主要成果:
- 在没有外部磁场的情况下产生强烈的THz辐射.
- 达到高达650千伏/厘米的焦点峰电场.
- 广泛的频率范围从0.1到5.5 THz.
- 从一个MGO涂层样本中证明了THz排放.
结论:
- 无外部磁场的STEs基于IronMnHydrogenCoFeBHydrogenW的异构结构是可行的.
- 基质优化和PC集成显著增强THz辐射.
- 这些高场STEs为先进的THz光谱和成像应用铺平了道路.
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