标题： 正负折射率活性超材料中的光学脉冲动力学 显示英文标题

标题： Optical Pulse Dynamics in Active Metamaterials with Positive and Negative Refractive Index

摘要： 我们通过数值研究了双色光脉冲在掺有活性原子的超材料中的传播，其中脉冲的载波频率与 $\Lambda$ 配置下的两个原子跃迁共振，并且一种颜色的光在正折射率下传播，另一种颜色的光在负折射率下传播。 在这种超材料中，一种共振光以正群速度和另一种共振光以负群速度传播。 我们研究了这些向前和向后传播波的非线性相互作用，发现自陷波、反向辐射波以及介质激发的热点。 显示英文摘要

摘要： We study numerically the propagation of two-color light pulses through a metamaterial doped with active atoms such that the carrier frequencies of the pulses are in resonance with two atomic transitions in the $\Lambda$ configuration and that one color propagates in the regime of positive refraction and the other in the regime of negative refraction. In such a metamaterial, one resonant color of light propagates with positive and the other with negative group velocity. We investigate nonlinear interaction of these forward- and backward-propagating waves, and find self-trapped waves, counter-propagating radiation waves, and hot spots of medium excitation.