微分器
旋涡
物理
角动量
脉搏(音乐)
光学
横截面
脉冲整形
包络线(雷达)
激光器
经典力学
电信
计算机科学
探测器
工程类
结构工程
雷达
带宽(计算)
作者
Junyi Huang,Jiahao Zhang,Tao Zhu,Zhichao Ruan
标识
DOI:10.1002/lpor.202100357
摘要
As a new degree of freedom for optical manipulation, recently spatiotemporal optical vortices (STOVs) carrying transverse orbital angular momentums have been experimentally demonstrated with pulse shapers. Here a spatiotemporal differentiator is proposed to generate STOVs with transverse orbital angular momentum. In order to create phase singularity in the spatiotemporal domain, the spatiotemporal differentiator is designed by breaking spatial mirror symmetry. In contrast to pulse shapers, the device proposed here is a simple one-dimensional periodic nanostructure and thus it is much more compact. For a normal incident pulse, the differentiator generates a transmitted STOV pulse with transverse orbital angular momentum. Furthermore, the interference of the generated STOVs can be used to detect the sharp changes of pulse envelopes, in both spatial and temporal dimensions.
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