SiO$_2$/CoFeB/金属异质结太赫兹信号发射的比较分析：PtBi基发射器的宽带与高频太赫兹信号优势
Comparative Analysis of THz Signal Emission from SiO$_2$/CoFeB/Metal Heterostructures: Wideband and High-Frequency THz Signal Advantage of PtBi-based Emitter
AI总结：
本文比较了SiO$_2$/CoFeB/金属异质结的太赫兹发射特性，发现Pt层发射幅度最高，而PtBi基发射器具有更高的中心频率和更宽带宽，为宽带太赫兹发射器设计提供了新方向。
摘要：
自旋电子学太赫兹发射器因其成本低廉、超宽带能力、高效率以及偏振可调等优良特性而备受关注。本研究考察了由铁磁（FM）和非磁（NM）材料构成的一系列异质结所发射的太赫兹信号的特性，包括频率、带宽和幅度。铁磁层由厚度为0至5 nm的楔形CoFeB层构成，而非磁材料包括Pt、Au、W、Ru、Pt$_{\%92}$Bi$_{\%8}$和Ag$_{\%90}$Bi$_{\%10}$合金等多种金属。我们的实验表明，具有Pt非磁层的发射器所发射的太赫兹信号幅度最高。然而，PtBi基发射器表现出更高的中心太赫兹峰值和更宽的带宽，使其成为宽带太赫兹发射器的有前景的候选方案。这些结果为进一步探索Pt$_{1-x}$Bi$_{x}$的特定组分以用于太赫兹发射器设计铺平了道路，尤其是以实现更高频率和更宽带宽的太赫兹信号生成为目标。这些进展在高分辨率成像、光谱学、通信、医学诊断等多个领域具有重要的应用潜力。
英文摘要：
Spintronic THz emitters have attracted much attention due to their desirable properties, such as affordability, ultra-wideband capability, high efficiency, and tunable polarization. In this study, we investigate the characteristics of THz signals, including their frequency, bandwidth, and amplitude, emitted from a series of heterostructures with ferromagnetic (FM) and nonmagnetic (NM) materials. The FM layer consists of a wedge-shaped CoFeB layer with a thickness of 0 to 5 nm, while the NM materials include various metals such as Pt, Au, W, Ru, Pt$_{\%92}$Bi$_{\%8}$, and Ag$_{\%90}$Bi$_{\%10}$ alloys. Our experiments show that the emitter with Pt-NM layer has the highest amplitude of the emitted THz signal. However, the PtBi-based emitter exhibits a higher central THz peak and wider bandwidth, making it a promising candidate for broadband THz emitters. These results pave the way for further exploration of the specific compositions of Pt$_{1-x}$Bi$_{x}$ for THz emitter design, especially with the goal of generating higher frequency and wider bandwidth THz signals. These advances hold significant potential for applications in various fields such as high-resolution imaging, spectroscopy, communications, medical diagnostics, and more.
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