拓扑保护下光单向传输器件的开发和应用

It is of vital application value in optical communications that one-way propagation of light can be achieved immune to scattering. The recent realizations of optical analogy to quantum spin Hall effect and Valley Hall effect in condensed matter physics using photonic crystals open the opportunity to introduce topological insulator theory for the design of one-way optical devices. In this proposal, based on the theory of topological insulators, the applicants intend to carry out the following theoretical and experimental studies:.1).To optimize the photonic crystal structures with optical quantum spin Hall effect and optical valley Hall effect, to be able to work at optical wavelengths;.2).To improve the one-way optical device performance by incorporating both the optical quantum spin Hall and valley Hall topologically protected light propagation mechanisms; .3).To study the peculiar physical properties of the finite-sized topological photonic crystal structures..The applicants hope that novel optical one-way device prototypes can be designed and fabricated based on the optimized topological photonic crystal structures and the new optical phenomena observed can verify the latest condensed matter theory and pave the road to next-generation optical components.

让光不受杂质和路径的影响进行单向传输在光通信上具有重大的应用价值。最新科研发现，量子自旋霍尔效应和谷霍尔效应的光学类比都可以利用光子晶体系统加以实现。本项目拟基于拓扑绝缘体理论，借助拓扑光子晶体结构调控，设计出工作在光学频段的具拓扑保护的光单向传输器件原型。开展：1) 对具备光学量子自旋霍尔效应和光学谷霍尔效应的光子晶体结构的构型优化；2) 协同光学量子自旋霍尔效应与光学谷霍尔效应两大拓扑保护物理机制，提升光学单向器件的性能；3) 研究有限尺寸拓扑光子晶体结构的奇异物理特性 等三个方面的理论及实验研究。希望通过优化和完善光学量子自旋霍尔效应和光学谷霍尔效应平台，开发新型光学单向器件；并籍由新光学现象的发现验证凝聚态物理的最新进展，为新一代光学元件的设计提供崭新思路。

拓扑物理的发展为下一代光通信技术提供了让光不受杂质和路径的影响进行单向传输的拓扑界面态。基于光学量子自旋霍尔效应和光学谷霍尔效应的光子晶体平台，本项目基于拓扑绝缘体理论，借助拓扑光子晶体结构调控，成功开展了：1) 对同时具备光学量子自旋霍尔效应和光学谷霍尔效应的光子晶体结构的构型优化，发现了拓扑角态产生的新规律；2) 设计构建了包括拓扑微腔、拓扑赝自旋控制器等光学器件，解决了拓扑界面态与传统光波导的耦合问题；3) 扩展了拓展拓扑物理在其他经典波动体系的实现，在光学超材料、拓扑电路、可重构声学拓扑超材料等三个方面发现了人造规范场和反手性界面态等新奇有趣的物理现象。通过理论结合实验，本项目在成功将拓扑引致的光单向传输界面态推向实际应用的同时，发展了新的经典波动实验平台用于验证凝聚态物理的最新进展。