论文标题
旋转Terahertz发射器的建模是自旋产生和扩散几何形状的函数
Modelling of Spintronic Terahertz Emitters as a function of spin generation and diffusion geometry
论文作者
论文摘要
Spintronic Thz发射器（Ste）是使用薄薄金属（HM）和铁磁 - 金属（FM）层构建的有效THZ源。为了提高Ste的性能，已实验应用了不同的结构方法（三层，堆叠的双层）。为了优化Ste的效率，必须对总体THZ排放过程进行理论描述。特别是，几何形状，组成，泵激光频率和自旋扩散对于理解进一步研究发展的途径将很重要。这项工作将基于修改的传输矩阵方法（TMM）应用广义模型。我们将考虑FM和HM层中的自旋产生和扩散，并解释自旋THZ发射过程。该模型适用于计算发射的THZ信号作为FM和HM厚度的函数，用于不同的几何构型。我们将研究双层几何形状作为测试用例，但是多层配置的扩展很简单。我们将展示样品的不同配置将如何影响THZ发射幅度。
Spintronic THz emitters (STE) are efficient THz sources constructed using thin heavy-metal (HM) and ferromagnetic-metal (FM) layers. To improve the performance of the STE, different structuring methods (trilayers, stacked bilayers) have been experimentally applied. A theoretical description of the overall THz emission process is necessary to optimize the efficiency of STE. In particular, geometry, composition, pump laser frequency, and spin diffusion will be significant in understanding the pathways for further research developments. This work will apply a generalized model based on a modified Transfer Matrix Method (TMM). We will consider the spin generation and diffusion in the FM and HM layers and explain the spintronic THz emission process. This model is suitable for calculating emitted THz signal as a function of FM and HM thicknesses for different geometrical configurations. We will investigate a bilayer geometry as a test case, but the extension to a multi-layer configuration is straightforward. We will show how the different configurations of the sample will influence the THz emission amplitude.
