通过数值仿真, 研究了空间孤子在经过一个宇称-时间(PT)对称纵向势垒之后的动态传播特性。仿真结果表明, 空间孤子穿越势垒之后有一个横向的偏折。偏折角度与PT对称势垒的增益/损耗项、调制深度以及纵向宽度有关, 增益/损耗项对空间孤子的动态特性有重要的影响。此外, 空间孤子在经过一个PT对称势垒之后会得到能量上的增益, 增益大小与偏折角度有密切的关系。通过调整势垒参数可以控制偏折的角度, 这使得空间孤子在光开关、光通信等众多领域中具有巨大的应用前景。

Dynamical propagation characteristics of spatial solitons after passing a parity-time (PT) symmetric potential with a longitudinal barrier is investigated by numerical simulation．The simulation results show that a spatial soliton transversally deflects after transmitting through the barrier. The deflection angle is related to the gain/loss coefficient, the modulation depth and the longitudinal dimension of the PT symmetric potential barrier. The gain/loss coefficient shows an important influence on the dynamical propagation characteristics of spatial solitons. Besides, after passing a PT symmetric potential barrier, the spatial soliton obtains an energy gain whose value is closely related to the deflection angle. By adjusting the barrier parameters, the deflection angle can be controlled. This makes spatial solitons have a great application potential in many fields such as optical switch and optical communications.