论文标题
拓扑保护的时空光学涡流，具有非局部空间摩尔摩尔与对称性的跨表面
Topologically protected generation of spatiotemporal optical vortices with nonlocal spatial-mirror-symmetry-breaking metasurface
论文作者
论文摘要
最近，已经提出了非局部空间摩尔对称性的跨腹面积来产生时空光学涡旋（STOV），后者携带横向轨道角动量。在这里，我们研究了STOV生成器的拓扑特性，并表明空间镜对称破坏引入了与元面几何相关的合成参数维度。此外，我们证明存在着具有合成参数维度的明确定义的涡旋，可以从拓扑上保护STOV的生成，以防止结构性扰动和疾病。由于涡流总是在$ {{k} _ {x}}} \！ - ！ - \！ω$域中以相反的电荷成对的“创建”或``歼灭''一起，因此这些涡流的总拓扑充电是保守的数量。我们的研究不仅为STOV生成提供了新的拓扑视角，而且还为与其他光电设备集成的Stov MetaSurfaces的潜在应用奠定了坚实的基础，因为它们对制造缺陷具有强大的免疫力。
Recently nonlocal spatial-mirror-symmetry-breaking metasurfaces have been proposed to generate spatiotemporal optical vortices (STOVs), which carry transverse orbital angular momenta. Here we investigate the topological property of the STOV generator and show that spatial mirror symmetry breaking introduces a synthetic parameter dimension associated with the metasurface geometry. Furthermore, we demonstrate that there are well-defined vortices emerging with the synthetic parameter dimension, which can topologically protect the STOV generation robustly against structural perturbations and disorders. Since the vortices are always `created' or `annihilated' together in pairs of opposite charges in the ${{k}_{x}}\!-\!ω$ domain, the total topological charge of these vortices is a conserved quantity. Our studies not only provide a new topological perspective for STOV generation but also lay a solid foundation for potential applications of STOV metasurfaces integrated with other optoelectronic devices, because of their robust immunity to fabrication defects.
