High‐Performance Organic Narrow Dual‐Band Circular Polarized Light Detection for Encrypted Communications and Color Imaging

Author:

Wang Qingkai12,Bao Jinying3,Zhang Yajie1,Wang Yuheng4,Qiu Dingding1,Yang Jiaxin5,Zhang Jianqi1,Gao Hanfei6,Wu Yuchen6,Dong Huanli5,Yang Huai3,Wei Zhixiang1ORCID

Affiliation:

1. CAS Key Laboratory of Nanosystem and Hierarchical Fabrication CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology Beijing 100190 China

2. University of Chinese Academy of Sciences Beijing 100049 P. R. China

3. School of Materials Science and Engineering Peking University Beijing 100871 P. R. China

4. Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo Zhejiang 315211 China

5. Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solid Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China

6. Key Laboratory of Bio‐Inspired Materials and Interfacial Science Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China

Abstract

AbstractConventional circularly polarized light (CPL) detectors necessitate several optical elements, posing difficulties in achieving miniature and integrated devices. Recently developed organic CPL detectors require no additional optical elements but usually suffer from low detectivity or low asymmetry factor (g‐factor). Here, an organic CPL detector with excellent detectivity and a high g‐factor is fabricated. By employing an inverted quasi‐planar heterojunction (IPHJ) structure and incorporating an additional liquid crystal film, a CPL detector with an outstanding g‐factor of 1.62 is developed. Unfavorable charge injection is effectively suppressed by the IPHJ structure, which reduces the dark current of the organic photodetector. Consequently, a left CPL detectivity of 6.16 × 1014 Jones at 640 nm is realized, surpassing all of the latest photodiode‐type CPL detectors. Adopting a liquid crystal film with adjustable wavelengths of selectively reflected light, the hybrid device achieves narrow dual‐band CPL detection, varying from 530 to 640 nm, with a half‐maximum full width below 90 nm. Notably, the device achieves excellent stability of 260 000 on/off cycles without attenuation. To the best of the authors’ knowledge, all these features have rarely been reported in previous work. The CPL detector arrays are also demonstrated for encrypted communications and color imaging.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Wiley

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