Parity-Time (PT )对称光学系统是近年提出的一种新型光学结构, 在光开关、光子信息处理器件等方面具有潜在的应用。在PT系统中许多奇异的光学现象都出现在PT破坏点附近，如单向不可见性等。针对这一特点，本项目将研究PT对称光学系统中破坏点的全光调控特性，寻找新的光学现象，揭示其物理机制，为未来的应用做准备。主要研究内容包括利用变分法和数值手段寻找各种PT 对称系统的解析解和数值解，探讨PT 对称破坏点与各种新奇光学现象的物理机制；研究和设计方案，通过利用非线性折射率效应改变PT 对称的破坏点调控PT 对称系统的光学特性，进而实现新型的光控制光的全光调控光子信息处理器件。PT 对称光学系统提供了一种新的控制光子的方法，与光子晶体和电磁特异性材料一样，将成为一种新的具有重要应用价值的人工合成材料。

Parity-Time symmetric optical system is a nwe optical structure presented in recent years. It will be widely applied to optical switch, photon information handling devices. Many unusual optical phenamena in PT system happen nearby the PT breaking points, such as unidirectional invisible. According to these properties, we will study the regulatory properties of breaking point in optical system with.parity-time symmetry. We will try to find the analytical and numerical solutions for different PT-symmetric system, by both the variational method and numerical simulations, and study the dynamics in the breakdown of PT-symmetry. We will try to find more new phenomena in the PT-symmetric systems and, understand its inherent physical mechanics, and propose some new application. By introducing the nonlinear refraction-index effect, we could change the break point of the PT-symmetric system, and consequently control its optical properties, that could be applied as new light-control-light photonic equipment. The PT-symmetric system will be a new important synthetic structure, like the photonic crystal and metamaterials, in the new generation photonic process applications.