CEMDATIC, ETSI Telecomunicación, Universidad Politécnica de Madrid, Av. Complutense 30, 28040, Madrid, Spain.
Sci Rep. 2023 Feb 10;13(1):2385. doi: 10.1038/s41598-023-29164-0.
A transparent variable diffractive spiral axicon (DSA) based on a single LC cell is presented. The manufactured DSA can be switched between 24 different configurations, 12 convergent and 12 divergent, where the output angle is varied as a function of the applied topological charge. The active area of the device is created using a direct laser writing technique in indium-tin oxide coated glass substrates. Liquid crystal is used to modulate the phase of the incoming beam generating the different DSA configurations. The DSA consists in 24 individually driven transparent spiral shaped electrodes, each introducing a specific phase retardation. In this article, the manufacture and characterization of the tunable DSA is presented and the performance of the DSA is experimentally demonstrated and compared to the corresponding simulations.
提出了一种基于单个 LC 单元的透明可变衍射螺旋轴棱锥（DSA）。所制造的 DSA 可以在 24 种不同的配置之间切换，其中 12 种是会聚的，12 种是发散的，输出角度随施加的拓扑电荷而变化。该器件的有效区域是使用在铟锡氧化物涂覆的玻璃衬底上的直接激光写入技术创建的。液晶用于调制入射光束的相位，从而产生不同的 DSA 配置。DSA 由 24 个单独驱动的透明螺旋状电极组成，每个电极引入特定的相位延迟。本文介绍了可调谐 DSA 的制造和特性，并对其性能进行了实验验证，并与相应的模拟进行了比较。
