Wang Jiuxu, Yu Feilong, Chen Jin, Wang Jie, Chen Rongsheng, Zhao Zengyue, Chen Jian, Chen Xiaoshuang, Lu Wei, Li Guanhai
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yu Tian Road, Shanghai, 200083, China.
University of Chinese Academy of Sciences, No.19 Yuquan Road, Beijing, 100049, China.
Adv Mater. 2023 Oct;35(41):e2304161. doi: 10.1002/adma.202304161. Epub 2023 Sep 8.
The Jones matrix, with eight degrees of freedom (DoFs), provides a general mathematical framework for the multifunctional design of metasurfaces. Theoretically, the maximum eight DoFs can be further extended in the spectrum dimension to endow unique encryption capabilities. However, the topology and intrinsic spectral responses of meta-atoms constrains the continuous engineering of polarization evolution over wavelength dimension. In this work, a forward evolution strategy to quickly establish the mapping relationships between the solutions of the dispersion Jones matrix and the spectral responses of meta-atoms is reported. Based on the eigenvector transformation method, arbitrary conjugate polarization channels over the continuous-spectrum dimension are successfully reconstructed. As a proof-of-concept, a silicon metadevice is demonstrated for optical information encryption transmission. Remarkably, the arbitrary combination forms of polarization and wavelength dimension increase the information capacity (2 ), and the measured polarization contrasts of the conjugate polarization conversion are >94% in the entire wavelength range (3-4 µm). It is believed that the proposed approach will benefit secure optical and quantum information technologies.
具有八个自由度（DoFs）的琼斯矩阵为超表面的多功能设计提供了一个通用的数学框架。理论上，最大的八个自由度可以在光谱维度上进一步扩展，以赋予独特的加密能力。然而，超原子的拓扑结构和固有光谱响应限制了在波长维度上极化演化的连续工程设计。在这项工作中，报道了一种正向演化策略，用于快速建立色散琼斯矩阵的解与超原子光谱响应之间的映射关系。基于特征向量变换方法，成功地在连续光谱维度上重建了任意共轭偏振通道。作为概念验证，展示了一种用于光学信息加密传输的硅超器件。值得注意的是，偏振和波长维度的任意组合形式增加了信息容量（2），并且在整个波长范围（3 - 4微米）内，共轭偏振转换的测量偏振对比度>94%。相信所提出的方法将有利于安全的光学和量子信息技术。
