Temporally modulated optical media are important in both abstract and applied applications, such as spacetime transformation optics, relativistic laser-plasma interactions, and dynamic metamaterials. Here we investigate the behaviour of temporal boundaries, and show that traditional approaches that assume constant dielectric properties, with loss incorporated as an imaginary part, necessarily lead to unphysical solutions. Further, although physically reasonable predictions can be recovered with a narrowband approximation, we show that appropriate models should use materials with a temporal response and dispersive behaviour.
Reflection and Refraction at Nonlinear Temporal Boundaries in Synthetic Lattices
Anhui Province Key Laboratory of Quantum Network, University of Science and Technology of China（安徽量子网络重点实验室，中国科学技术大学）；CAS Center For Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China（中国科学院量子信息与量子物理学卓越创新中心，中国科学技术大学）；Hefei National Laboratory, University of Science and Technology of China（合肥国家实验室，中国科学技术大学）；Anhui Center for Fundamental Sciences in Theoretical Physics, University of Science and Technology of China（安徽理论物理基础科学中心，中国科学技术大学）
Symmetry classification of temporal reciprocity in time-varying electromagnetic media
Research Institute of Basic Sciences, Ajou University（延世大学基础科学研究院）；Department of Physics, Ajou University（延世大学物理系）；School of Physics, Korea Institute for Advanced Study（韩国高等研究院物理学院）
Coupled-mode theory for electromagnetic pulse propagation in dispersive media undergoing a spatio-temporal perturbation - exact derivation, numerical validation and peculiar wave mixing
Optical Spin Effects Induced by Phase Conjugation at a Space-Time Interface
Department of Physical and Chemical Sciences, University of L’Aquila（拉奎拉大学物理与化学科学系）；Fields & Waves Lab, Department of Engineering, University of Sannio（桑尼奥大学工程学院波场实验室）；Department of Information Engineering, University of Brescia（布雷西亚大学信息工程系）；Institute of Photonics and Quantum Sciences, Heriot-Watt University（赫瑞-瓦特大学光子学与量子科学研究所）；CNR-SPIN, c/o Department of Physical and Chemical Sciences, University of L’Aquila（意大利国家研究委员会自旋物理中心（挂靠拉奎拉大学物理与化学科学系））；Aviation and Missile Center, U.S. Army CCDC（美国陆军CCDC航空与导弹中心）
d'Alembert Digitized: A Wave Pulse Method for Visualizing Electromagnetic Waves in Matter and for Deriving the Finite Difference Time Domain Method for Numerically Solving Maxwell's Equations
