基于超构表面的多维矢量混沌光场调控研究

激光混沌能够在物理层保证信息传输的安全性，在安全光通信等领域引起了广泛关注。由于缺乏光场的时空调控能力，传统激光混沌技术面临带宽有限、复杂度低等问题，难以满足高速、高安全性光通信的需求。超构表面可以在亚波长尺度实现光场的时空按需调控，为制备宽带、高复杂度的矢量混沌信号提供了新的技术路线。目前，基于超构表面的矢量混沌光场调控研究正处于前沿探索阶段，相关的调控理论体系、性能优化设计及时空动力学分析等问题亟需进一步探索。本项目围绕混沌光场和亚波长结构相互作用的基础科学问题，开展基于超构表面的多维矢量混沌光场调控研究。项目将阐明超构表面对矢量混沌光场的多维调控机理，研制面向宽带、高复杂度矢量混沌光场的拓扑优化超构表面，揭示矢量混沌光场的时空动力学演变规律，并验证超构表面矢量混沌保密器件。研究成果有望解决传统激光混沌的带宽和复杂度受限难题，并推动超构表面在混沌光场调控、高速安全光通信等领域的新应用。

Laser chaos could guarantee the security of information transmission in the physical layer and has attracted great interests in the field of secure optical communication. However, due to the lack of spatiotemporal regulation capability of light field, traditional laser chaotic signal has the inherent problems of limited bandwidth and low complexity, which are difficult to meet the demand of high-speed and high-security optical communication. On the other hand, metasurface could artificially manipulate the light at subwavelength scale, both in space and time domain, offering a new opportunity to realize wide bandwidth and high complexity vector chaotic optics. Recently, the metasurface based vector chaotic optics is still been rarely investigated and several important issues remain to be further explored, including theoretical architecture, performance optimization and inverse design of metasurface, and analysis of spatiotemporal dynamics. Here, to clarify the basic scientific problems of the interactions between laser chaotic light field and subwavelength structures, this project will study the subwavelength metasurface-based vector chaotic optics and its potential applications. Specifically, we will reveal the vector regulation mechanism of chaotic light field in subwavelength structures and develop the freeform metasurface for wide bandwidth and high complexity vector chaos by using topology optimization approach. We will further investigate the dynamical evolution of vector chaotic optical signal and experimentally demonstrate the corresponding vector chaos-based security devices. The results will overcome the difficult problems of limited bandwidth and complexity in traditional laser chaos, providing an impetus to the applications of subwavelength metasurface in different areas such as chaotic light field regulation and high-speed secure optical communications.