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Promoting spintronic terahertz radiation via Tamm plasmon coupling
Photonics Research ( IF 7.6 ) Pub Date : 2023-05-26 , DOI: 10.1364/prj.487711
Yunqing Jiang, Hongqing Li, Xiaoqiang Zhang, Fan Zhang, Yong Xu, Yongguang Xiao, Fengguang Liu, Anting Wang, Qiwen Zhan, and Weisheng Zhao

Spectral fingerprint and terahertz (THz) field-induced carrier dynamics demands the exploration of broadband and intense THz signal sources. Spintronic THz emitters (STEs), with high stability, a low cost, and an ultrabroad bandwidth, have been a hot topic in the field of THz sources. One of the main barriers to their practical application is lack of an STE with strong radiation intensity. Here, through the combination of optical physics and ultrafast photonics, the Tamm plasmon coupling (TPC) facilitating THz radiation is realized between spin THz thin films and photonic crystal structures. Simulation results show that the spectral absorptance can be increased from 36.8% to 94.3% for spin THz thin films with TPC. This coupling with narrowband resonance not only improves the optical-to-spin conversion efficiency, but also guarantees THz transmission with a negligible loss (4%) for the photonic crystal structure. According to the simulation, we prepared this structure successfully and experimentally realized a 264% THz radiation enhancement. Furthermore, the spin THz thin films with TPC exhibited invariant absorptivity under different polarization modes of the pump beam and weakening confinement on an obliquely incident pump laser. This approach is easy to implement and offers possibilities to overcome compatibility issues between the optical structure design and low energy consumption for ultrafast THz opto-spintronics and other similar devices.

中文翻译:

通过塔姆等离子体耦合促进自旋电子太赫兹辐射

光谱指纹和太赫兹 (THz) 场引起的载流子动力学需要探索宽带和强太赫兹信号源。自旋电子太赫兹发射器(STE)具有高稳定性、低成本和超宽带宽等特点,一直是太赫兹源领域的研究热点。其实际应用的主要障碍之一是缺乏具有强辐射强度的 STE。在这里,通过光学物理和超快光子学的结合,在自旋太赫兹薄膜和光子晶体结构之间实现了促进太赫兹辐射的塔姆等离子体耦合 (TPC)。仿真结果表明,使用 TPC 的自旋太赫兹薄膜的光谱吸收率可以从 36.8% 提高到 94.3%。这种与窄带共振的耦合不仅提高了光自旋转换效率,~ 4 % ) 对于光子晶体结构。根据模拟,我们成功制备了该结构,并通过实验实现了 264% 的 THz 辐射增强。此外,具有 TPC 的自旋太赫兹薄膜在泵浦光束的不同偏振模式下表现出不变的吸收率,并且减弱了对倾斜入射泵浦激光器的限制。这种方法易于实施,并为克服超快太赫兹光自旋电子学和其他类似设备的光学结构设计和低能耗之间的兼容性问题提供了可能性。
更新日期:2023-05-26
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