论文标题
各向异性的Terahertz Optostriction在IV单藻元化合物中
Anisotropic terahertz optostriction in group-IV monochalcogenide compounds
论文作者
论文摘要
Terahertz（THZ）技术是一种尖端方案，具有各种有前途的应用，例如下一代电信，非破坏性评估，安全检查和深入的表征，因为它们对物质几何变化和良好的透明度的敏感性。即使在过去十年中取得了巨大进展，但探索THZ-MARTANT相互作用显微镜的机制仍处于起步阶段。在这项工作中，我们使用热力学理论来展示THZ照明如何变形材料并使用IV组单核化合物化合物来说明它。根据我们的第一原理密度功能理论的计算，具有中间强度的THZ光（〜109 w/cm2）可以根据激光极化方向产生〜0.1％的弹性变形。还揭示了大型各向异性光学机电反应。最后，我们表明可以通过在探针光照射下测量层分辨的移位电流来检测到这种应变。
Terahertz (THz) technology is a cutting-edge scheme with various promising applications, such as next generation telecommunication, non-destructive evaluation, security check, and in-depth characterization, owing to their sensitivity to material geometric change and good transparency. Even though tremendous progresses have been made during the past decade, exploration the mechanisms of THz-matter interaction microscopically is still in its infancy. In this work, we use thermodynamic theory to show how THz illumination deforms materials and use group-IV monochalcogenide compounds to illustrate it. According to our first-principles density functional theory calculations, THz light with intermediate intensity (~109 W/cm2) could yield elastic deformations on the order of ~0.1%, depending on laser polarization direction. Large anisotropic opto-mechanical responses are also revealed. Finally, we show that such strain can be detected via measuring the layer-resolved shift current under a probe light irradiation.
