Chang Li Min, Feng Ting-Mao, Lin Kuan-Wu, Tseng Heng-Yi, Li Cheng-Chang, Guo Duan-Yi, Jau Hung-Chang, Wang Chun-Ta, Lin Tsung-Hsien
Opt Express. 2022 Feb 14;30(4):4886-4894. doi: 10.1364/OE.447256.
Linear polarization rotators have been widely used in optical systems. Commonly used polarization rotators are still beset by strong dispersion and thus restricted spectral bandwidth of operation. This leads to the development of achromatic or broadband alternatives, but most of them incorporate multiple waveplates for retardation compensation, which comes at the cost of increased complexity and reduced flexibility in operation and system design. Here, we demonstrate a single-element achromatic polarization rotator based on a thin film of dual-frequency chiral liquid crystal. The angle of polarization rotation is electrically tunable from 0° to 180° with low dispersion (±3°) in the entire visible spectrum, and a high degree of linear polarization (>95%) at the output.
线性偏振旋转器已在光学系统中得到广泛应用。常用的偏振旋转器仍受强色散困扰，因此限制了其工作的光谱带宽。这促使了消色差或宽带替代品的发展，但其中大多数都采用多个波片进行相位延迟补偿，这是以增加复杂性以及降低操作和系统设计的灵活性为代价的。在此，我们展示了一种基于双频手性液晶薄膜的单元件消色差偏振旋转器。在整个可见光谱范围内，偏振旋转角度可通过电调谐在0°至180°之间变化，且色散低（±3°），输出端具有高度线性偏振（>95%）。
