Zhang Boyu, Zhao Sixiang, Yu Yingying, Li Ming, Zhao Liancheng, Gao Liming
State Key Laboratory of Metal Matrix Composites, School of Material Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Nanomaterials (Basel). 2021 Nov 16;11(11):3098. doi: 10.3390/nano11113098.
Circularly polarized light (CPL) detection and polarization state recognition are required for a wide range of applications. Conventional polarization detection with optical components causes difficulties for miniaturization and integration. An effective design strategy is proposed for direct CPL detection with chiral material. Here, we realized direct CPL detection based on the combination of chiral photonic cellulose nanocrystal (CNC) and ultraviolet-sensitive ZnO photoconductive material. The CNC layer deposited by evaporation-induced self-assembly established the left-handed chiral nematic structure with a photonic bandgap (PBG) to recognize left-handed CPL (LCPL) and right-handed CPL (RCPL) at specific wavelengths. The PBG of CNC layer has been modulated by the adjustment of chiral nematic pitch to match the semiconductor bandgap of ZnO film in ultraviolet region. The photocurrents under RCPL and LCPL are 2.23 × 10 A and 1.77 × 10 A respectively and the anisotropy factor Δ of 0.23 is acquired for the CPL detection based on the chiral photonic CNC. This design provides a new approach to the detection of CPL polarization state with competitive performance.
圆偏振光（CPL）检测和偏振态识别在广泛的应用中是必需的。使用光学元件进行传统的偏振检测给小型化和集成带来了困难。提出了一种利用手性材料进行直接CPL检测的有效设计策略。在此，我们基于手性光子纤维素纳米晶体（CNC）和紫外敏感的ZnO光电导材料的组合实现了直接CPL检测。通过蒸发诱导自组装沉积的CNC层建立了具有光子带隙（PBG）的左旋手性向列结构，以在特定波长下识别左旋CPL（LCPL）和右旋CPL（RCPL）。通过调节手性向列螺距来调制CNC层的PBG，以使其与ZnO薄膜在紫外区域的半导体带隙相匹配。在RCPL和LCPL下的光电流分别为2.23×10 A和1.77×10 A，并且基于手性光子CNC的CPL检测获得了0.23的各向异性因子 Δ 。这种设计为具有竞争性能的CPL偏振态检测提供了一种新方法。
