通过几何相位的工程monstar偏振向错
Engineering monstar polarization disclination through geometric phase
摘要：
本文提出了一种利用两束自由暗空心光束$FFDH^{m}_{q}$的相干共线叠加，通过Pancharatnam-Berry相位产生Monstar奇点的方法，光束的拓扑荷为$q$，对称阶为$m$ .利用闭合曲线的几何参数产生FFDH光束，以获得局部偏振方位角的非均匀旋转速率并产生monstar图案。我们报告的空间变化的偏振模式：径向和方位角一样，柠檬和明星一样的对称向错，和非对称monstar向错。我们目前的理论和测量，并发现两者之间的良好协议。
英文摘要：
We present a method to generate monstar singularities via Pancharatnam-Berry phase by the coherent collinear superposition of two Free-Form Dark Hollow beams, $FFDH^{m}_{q}$, of topological charge $q$, and order of symmetry $m$. FFDH beams are generated with the geometrical parameters of a closed curve exploited to obtain a nonuniform rotation rate of the local polarization azimuth and generate monstar patterns. We report space-variant polarization patterns: radial- and azimuthal-like, lemon- and star-like for symmetric disclinations, and the asymmetric monstar disclination. We present theory and measurements, and find excellent agreement between the two.
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