横向光学偏振莫比乌斯带的产生
Generation of transversely oriented optical polarization Möbius strips
摘要：
我们报告了一种基于Richards-Wolf矢量衍射理论的时间反转方法，以产生横向取向的光学莫比乌斯带，该莫比乌斯带围绕垂直于光束传播方向的轴徘徊。多组偶极天线有目的地定位在y = 0平面中的规定轨迹上，并且辐射场由一个高NA物镜收集。通过以时间反演的方式发送辐射场的复共轭，计算聚焦场，并且可以定制轨迹上的光学偏振拓扑以形成规定的莫比乌斯带。该方法可以扩展到在聚焦区域的三维轨迹上构造各种偏振拓扑。控制光学偏振拓扑的能力可能会在纳米纤维、量子通信和光-物质相互作用中找到应用。
英文摘要：
We report a time-reversal method based on the Richards-Wolf vectorial diffraction theory to generate transversely oriented optical Möbius strips that wander around an axis perpendicular to the beam propagation direction. A number of sets of dipole antennae are purposefully positioned on a prescribed trajectory in the y = 0 plane and the radiation fields are collected by one high-NA objective lens. By sending the complex conjugate of the radiation fields in a time-reversed manner, the focal fields are calculated and the optical polarization topology on the trajectory can be tailored to form prescribed Möbius strips. The method can be extended to construct various polarization topologies on three-dimensional trajectories in the focal region. The ability to control optical polarization topologies may find applications in nanofabrication, quantum communications, and light-matter interactions.
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