Manipulating the polarization orientation of light is essential in modern optics, biology, and related fields, but the strong optical dispersion inherent in current polarization rotators severely restricts their use to single-frequency lasers and their flexibility in system design. Many attempts have been made to realize dispersionless polarization rotation, usually by designing a complex set of wave plates with mutually compensated dispersions. Here, enabled by a thin cell of hybrid splay–twist liquid crystal, we demonstrate a tunable achromatic polarization rotator that is free of dispersion engineering. The optic axis distribution in the liquid crystal cell can be dynamically controlled by an applied electric field and allows an input polarization vector to be continuously rotated up to 90° (or 180° in a tandem-cell geometry) in an adiabatic and nondispersive manner. The proposed mechanism can be further implemented to construct spatial light modulators for single-path ultrabroadband generation of complex vector fields from uniformly polarized light.

中文翻译：

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电可调消色差偏振旋转器

操纵光的偏振方向在现代光学，生物学和相关领域中至关重要，但是当前偏振旋转器固有的强光色散严重限制了它们在单频激光器中的使用以及它们在系统设计中的灵活性。通常通过设计一组具有相互补偿的色散的波片，进行了许多尝试来实现无色散偏振旋转。在这里，通过混合八字形扭曲液晶薄单元的支持，我们演示了一种无需色散工程的可调谐消色差偏振旋转器。液晶盒中的光轴分布可以通过施加的电场进行动态控制，并允许输入偏振矢量以绝热和非分散的方式连续旋转高达90°（在串联单元几何中为180°）。可以进一步实现所提出的机制，以构造空间光调制器，用于从均匀偏振光的复杂向量场的单路径超宽带生成。