Wang Donghui, Wang Shaocong, Dong Yu, Wu Xiaosong, Shen Jinghui, Feng Shiyu, Wang Zhongrui, Huang Weiguo
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350002, P. R. China.
Adv Mater. 2025 Apr;37(14):e2419747. doi: 10.1002/adma.202419747. Epub 2025 Mar 3.
Circularly polarized light (CPL) is fundamental to phase-controlled imaging, quantum optics, and optical computing. Conventional CPL detection, relying on polarizers and quarter-wave plates, complicates device design and reduces sensitivity. Among emerging CPL detectors, organic field-effect transistors (OFET) with helical organic semiconductors are highly promising due to their compact structures but suffer tedious synthesis, low dissymmetric factors (g < 0.1), and high operating voltages (> 50 V). To address these issues, an opto-iontronic cholesteric liquid crystalline (i-CLC) film is developed that is both electrically and photonically active, serving as the dielectric in phototransistors. The well-defined cholesteric structure and broadly tunable pitches of the i-CLC film enable it to detect CPL with an excellent "handedness" selectivity across a broad spectrum. Moreover, its ionic nature provides a high capacitance (up to 580 nF cm @20 Hz). The resulting flexible CPL detectors achieve an unprecedentedly high dissymmetry factor (g = 1.33) at low operating voltages (< 5 V), showcasing significant potential in optical communication and data encryption. Furthermore, leveraging high g, they can perform in-sensor computing for highly accurate semantic segmentation using fused multimodal visual inputs (e.g., circularly polarized and ordinary light), achieving an accuracy of 75.73% and a mean intersection over the union of 0.3982, surpassing the performance of non-CPL photodetectors. Additionally, it optimizes power consumption by a factor of 10 compared to most conventional visual processing systems, offering a groundbreaking hardware solution for high-performance neuromorphic CPL vision.
圆偏振光（CPL）对于相位控制成像、量子光学和光学计算至关重要。传统的CPL检测依赖于偏振器和四分之一波片，这使得设备设计复杂化并降低了灵敏度。在新兴的CPL探测器中，具有螺旋有机半导体的有机场效应晶体管（OFET）因其结构紧凑而极具前景，但存在合成繁琐、不对称因子低（g < 0.1）和工作电压高（> 50 V）的问题。为了解决这些问题，开发了一种光电离子胆甾型液晶（i-CLC）薄膜，它兼具电活性和光活性，可作为光电晶体管中的电介质。i-CLC薄膜明确的胆甾型结构和广泛可调的螺距使其能够在宽光谱范围内以优异的“手性”选择性检测CPL。此外，其离子性质提供了高电容（在20 Hz时高达580 nF cm）。由此产生的柔性CPL探测器在低工作电压（< 5 V）下实现了前所未有的高不对称因子（g = 1.33），在光通信和数据加密方面展现出巨大潜力。此外，利用高g值，它们可以使用融合的多模态视觉输入（例如圆偏振光和普通光）进行高精度语义分割的传感器内计算，准确率达到75.73%，平均交并比为0.3982，超过了非CPL光电探测器的性能。此外，与大多数传统视觉处理系统相比，它将功耗优化了10倍，为高性能神经形态CPL视觉提供了开创性的硬件解决方案。
