空间扭曲液晶器件
Spatially twisted liquid-crystal devices
AI总结：
针对现有液晶器件取向层图案一致的局限，本文提出前后取向层图案不同的非对称空间扭曲液晶结构，制备多q波片并通过偏振表征验证其具备新功能。
摘要：
向列相液晶器件是在经典与量子体系下对光的不同自由度进行结构调控的有力工具。这类器件大多采用两种工作模式：一种是光轴均匀取向，引入位置相关的相位延迟，例如基于液晶的空间光调制器；另一种是采用均匀可调的相位延迟与图案化光轴，例如q波片，这类器件的两个取向层图案完全一致。本文研究了更具普适性的情况：器件前后两个取向层采用不同的图案设计，构建出非对称器件，其特性会随光束传播方向、有效相位延迟的变化呈现不同行为。研究团队通过在两个取向层设置不同拓扑荷制备了多q波片，采用空间分辨斯托克斯偏振测量法，在施加与不施加外加电压的条件下对器件进行表征，验证了该类器件具备全新功能。
英文摘要：
Nematic liquid-crystal devices are a powerful tool to structure light in different degrees of freedom, both in classical and quantum regimes. Most of these devices exploit either the possibility of introducing a position-dependent phase retardation with a homogeneous alignment of the optic axis -- e.g., liquid-crystal-based spatial light modulators -- or conversely, with a uniform but tunable retardation and patterned optic axis, e.g., $q$-plates. The pattern is the same in the latter case on the two alignment layers. Here, a more general case is considered, wherein the front and back alignment layers are patterned differently. This creates a non-symmetric device which can exhibit different behaviours depending on the direction of beam propagation and effective phase retardation. In particular, we fabricate multi-$q$-plates by setting different topological charges on the two alignment layers. The devices have been characterized by spatially resolved Stokes polarimetry, with and without applied electric voltage, demonstrating new functionalities.
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