论文标题
从瞬时镜子产生的时期水波
Time-Reversed Water Waves Generated from an Instantaneous Time Mirror
论文作者
论文摘要
瞬时时间镜（ITM）是一种有趣的方法，可以从时间边界开始操纵波传播。在时域中，反向波先前被证明是原始模式的时间导数。在这里，我们进一步研究了理论上和实验上空间域中的波模式之间的关系。激光束的平方阵列的折射用于确定水面的三维（3D）形状。实验结果验证了相反模式与初始波场的拉普拉斯式有关的理论预测。根据这些发现，讨论了在不均匀介质中激活的ITM的行为，并解释了总能量变化的现象。
An instantaneous time mirror (ITM) is an interesting approach to manipulate wave propagation from the time boundaries. In the time domain, the reversed wave is previously proven to be the temporal derivative of the original pattern. Here, we further investigate into the relationship between the wave patterns in the spatial domain both theoretically and experimentally. The refraction of a square array of laser beams is used to determine the three-dimensional (3D) shape of the water surface. The experimental results verify the theoretical prediction that the reversed pattern is related to the Laplacian of the initial wave field. Based on these findings, the behaviors of the ITM activated in an inhomogeneous medium are discussed, and the phenomenon of total energy change is explained.
