具有Parity-Time (PT)对称性的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。文章数值研究了局域单PT对称光学系统中基态孤子的存在范围与稳定特性。研究结果表明: 基态孤子存在一临界传播常数, 该传播常数对应线性模下的本征值。孤子的能量随着传播常数的增加而增加, 但随着PT对称势的调制深度的增加而减少。基态孤子在较深和较浅的PT对称势中都能稳定地传输。

Parity-time (PT ) symmetric optical system is a new optical structure presented in recent years. It will be widely applied to optical switch and photon information handling devices. The existence and stability of fundamental solitons with PT symmetric single complex potentials are reported. The results show that there exists a critical propagation constant, and the eigenvalue for fundamental linear mode is equal to the critical propagation constant of fundamental solitons existence. The power of solitons increases with increasing propagation constant or decreasing modulation depth of the potentials. Fundamental solitons are stable not only in deep potentials but also in shallow potentials.