Since many applications of terahertz spectroscopy depend on spectral bandwidth, the generation of ultra-broadband terahertz radiation is one of the most important challenges faced by terahertz scientists. Spintronic terahertz emitters (STEs) are promising sources to produce very compact terahertz pulses and broadband spectra. Here we optimized the iron/gold heterostructure based on the metal layer thicknesses for the first time. The optimization was performed experimentally based on the obtained theoretical results. The optimized thicknesses were obtained as 2 and 5 nm for Fe and Au layers, respectively. The experimental results were in very good agreement with corresponding theoretical results. The optimized STE generates terahertz bandwidth up to 4 THz which is limited by the frequency response of the used detector. The dynamic range is well above 60 dB with the maximum around 0.5 THz. The results show that the presented STE is capable of producing large amplitude terahertz pu...

中文翻译：

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基于Fe / Au金属异质结构逆自旋霍尔效应的高性能太赫兹发射器

由于太赫兹光谱的许多应用都取决于光谱带宽，因此超宽带太赫兹辐射的产生是太赫兹科学家面临的最重要挑战之一。自旋电子太赫兹发射器（STE）是产生非常紧凑的太赫兹脉冲和宽带光谱的有前途的光源。在这里，我们首次基于金属层的厚度优化了铁/金异质结构。根据获得的理论结果，通过实验进行了优化。Fe和Au层的最佳厚度分别为2和5 nm。实验结果与相应的理论结果非常吻合。优化的STE产生高达4 THz的太赫兹带宽，这受所用检测器的频率响应限制。动态范围远高于60 dB，最大值约为0.5 THz。结果表明，所提出的STE能够产生大幅度的太赫兹脉冲。