论文标题
超级拓扑工程超材料
Ultrafast Topological Engineering in Metamaterials
论文作者
论文摘要
瞬态光学加热提供了一种有效的方法，可以通过超短激光脉冲照射触发天然培养基的相变。可以使用类似的方法在适当设计的人工结构的光子响应中诱导拓扑相变，称为超材料。在这里，我们预测光学泵送下分层石墨烯材料的同频分散轮廓的拓扑过渡。我们表明，轮廓拓扑通过利用石墨烯的非凡光热特性来从子秒时间内的椭圆形变为双曲线。这种新现象使我们能够从理论上证明在工程上的应用中，近端光学发射器，超快束转向和动力学远场亚波长度成像。我们的研究为超快控制光发射，光束转向和光学图像处理开辟了一种破坏性方法。
Transient optical heating provides an efficient way to trigger phase transitions in naturally occurring media through ultrashort laser pulse irradiation. A similar approach could be used to induce topological phase transitions in the photonic response of suitably engineered artificial structures known as metamaterials. Here, we predict a topological transition in the isofrequency dispersion contours of a layered graphene metamaterial under optical pumping. We show that the contour topology transforms from elliptic to hyperbolic within a subpicosecond timescale by exploiting the extraordinary photothermal properties of graphene. This new phenomenon allows us to theoretically demonstrate applications in engineering the decay rate of proximal optical emitters, ultrafast beam steering, and dynamical far-field subwavelength imaging. Our study opens a disruptive approach toward ultrafast control of light emission, beam steering, and optical image processing.
