Xu Jingwei, Mai Wending, Werner Douglas H
Department of Electrical Engineering, The Pennsylvania State University, University Park, PA 16802, USA.
Nanophotonics. 2022 Mar 7;11(7):1309-1320. doi: 10.1515/nanoph-2021-0715. eCollection 2022 Mar.
Opening a new door to tailoring electromagnetic (EM) waves, temporal boundaries have attracted the attention of researchers in recent years, which have led to many intriguing applications. However, the current theoretical approaches are far from enough to handle the complicated temporal systems. In this paper, we develop universal matrix formalism, paired with a unique coordinate transformation technique. The approach can effectively deal with temporally stratified structures with complicated material anisotropy and arbitrary incidence angles. This formulation is applied to various practical systems, enabling the solution of these temporal boundary related problems in a simple and elegant fashion, and also facilitating a deep insight into the fundamental physics.
时间边界为定制电磁波打开了一扇新的大门，近年来吸引了研究人员的关注，这也带来了许多有趣的应用。然而，当前的理论方法远不足以处理复杂的时间系统。在本文中，我们开发了通用矩阵形式体系，并结合了一种独特的坐标变换技术。该方法能够有效地处理具有复杂材料各向异性和任意入射角的时间分层结构。这种公式被应用于各种实际系统，能够以简单而优雅的方式解决这些与时间边界相关的问题，同时也有助于深入洞察基本物理原理。
