More durable (with high impact force), lighter, and more compact flexible azo dye micropolarizers are attractive candidates for low-cost, simple polarization imaging systems. The liquid crystal polymer (LCP), as an emerging material developed by photo-alignment technology, is a potential material for organizing the long-range ordered structure of azo dyes. However, little research has been done on LCP aligned azo dyes. This paper points out and solves a key problem that restricts the fabrication of high-precision arrays in guest (azo dye)-host (LCP) systems: the doping of dyes leads to disorder of the LCP during curing. After solving the problem, the relationship between the thickness of the LCP and the extinction ratio of the polarizing film was investigated, which effectively improved the extinction ratio. Alignment of azo dye molecules in the range of 2 µm (0°–180°) and arrays of micropolarizers (0°, 45°, 90°, -45°) with 8 µm × 8 µm pixel pitch was achieved by laser direct writing technology. The bending cycle test demonstrates the mechanical stability of the ultrathin flexible polarizer. The flexible patterned polarizer with robust chemical and mechanical stabilities provides a flexible way to capture the polarization of the light and highly integrated advanced flexible optoelectronic devices.

以三（二甲胺基）膦为膦源，氯化铟为铟源，采用热注射法制备波长可调的无毒InP/ZnS量子点，研究了反应物P与In的摩尔比、ZnI₂和ZnCl₂的摩尔比以及ZnS的反应时间对合成的InP/ZnS量子点微观结构和光学性能的影响。实验结果表明，在反应物摩尔比为n_P^3-∶n_In³⁺ = 5∶1、ZnS反应时间为60 min时，合成的InP/ZnS量子点近似球形，属于闪锌矿结构，其荧光光谱在460 nm~620 nm范围内可调。蓝色、绿色、红色波段的InP/ZnS量子点的半高宽分别约为52、52、59 nm，平均粒径分别为3.05、3.32、3.44 nm，荧光寿命分别为59.41、61.44和68.08 ns。利用激光辅助制备绿色图形化InP/ZnS薄膜，以蓝光OLED作为激发光源，结合DBR微结构，薄膜的色彩转换效率可达到20.9%，色坐标从（0.22，0.30）变化到（0.29，0.63）。这些InP/ZnS量子点发光器件在照明和显示方面具有潜在的应用价值。

Optical edge detection, a part of image processing, plays an important role in extracting image information used in optical analog computation. In this Letter, we raise a new way to realize optical edge detection. This design is based on two liquid crystal polarization gratings with a period of 2.2 mm, which function as a spatial differentiator. We experimentally demonstrate broadband optical detection and real-time adjustable resolution. The proposed method takes advantage of the convenience to use, simple fabrication process, and real-time tunable resolution. It may guide more significant applications in the optical field and other practical scenarios like machine vision in computers.

We experimentally demonstrate a metamaterials (MMs)-based terahertz (THz) sensor to quickly distinguish the cancer tissues from normal tissues. The MMs-based THz sensor has two strong resonance absorption peaks at about 0.706 and 1.14 THz, respectively. When the sensor is covered with cancer tissues, the redshifts at about 0.706 and 1.14 THz are 31 and 19 GHz, respectively. However, if normal tissue is attached to the surface of the sensor, the corresponding redshifts are only 15 and 12 GHz, respectively. This study proposes a new method for quick diagnosis of early lung cancer and other cancers.