华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062
研究了电磁感应透明条件下五能级M型原子体系中探测光脉冲的非线性传播。当探测光脉冲的脉宽较大时,其色散效应可忽略,脉冲内具有不同偏振方向和不同边带的4个分量可发生四波混频,相互交换能量;当探测光脉冲的脉宽较短时,必须考虑其色散效应,4个分量可形成一种全新的四分量超慢光孤子。产生这种四分量超慢光孤子的输入功率为微瓦量级,远低于光纤中产生矢量光孤子所需的能量。
非线性光学 偏振 四波混频 光孤子 光学学报
2018, 38(10): 1019001
Author Affiliations
Abstract
State Key Laboratory of Precision Spectroscopy and Department of Physics, East China Normal University, Shanghai 200062, China
We propose a scheme to obtain a low-loss propagation of Airy surface plasmon polaritons (SPPs) along the interface between a dielectric and a negative-index metamaterial (NIMM). We show that by using the transverse-magnetic mode and the related destructive interference effect between electric and magnetic absorption responses, the propagation loss of the Airy SPPs can be largely suppressed when the optical frequency is close to the lossless point of the NIMM. As a result, the Airy SPPs obtained in our scheme can propagate more than a 6 times longer distance than that in conventional dielectric–metal interfaces.
240.0240 Optics at surfaces 240.6680 Surface plasmons 160.3918 Metamaterials Chinese Optics Letters
2015, 13(8): 082401
华东师范大学精密光谱科学与技术国家重点实验室, 上海 200062
介绍了最近发展的主动拉曼增益介质中快光传播的非线性理论。首先介绍了三能级Λ型和四能级N型主动拉曼增益介质中光的线性传播特性的研究结果，指出两者都可实现群速度为负值的快光传播，但在四能级体系中由于额外耦合光场的引入可导致量子干涉效应，使得信号光场的单峰增益谱线劈裂为双峰结构，利用该特性可实现共振点附近介质增益的有效抑制。其次介绍了在四能级体系中利用主动拉曼增益获得Kerr非线性效应的显著增强。再次介绍了主动拉曼增益体系中弱光的非线性传播。通过体系的色散与Kerr非线性效应的平衡可实现光学厚介质中非线性光脉冲的稳定传播，特别是形成弱光水平下的快光孤子。最后对主动拉曼增益体系中快光的进一步研究提出了展望。
主动拉曼增益 快光传播 Kerr非线性 快光孤子
Author Affiliations
Abstract
Department of Physics, East China Normal University, Shanghai 200062
We study the Faraday rotation of polarization of a probe field in a cold, coherently driven five-level system with an M-type configuration. By means of a method of multiple scales we derive two coupled nonlinear envelope equations, which govern the evolution of two circularly polarized components of the probe field. It is shown that due to the quantum interference effect induced by two control fields, one can obtain a large rotation angle with a very low absorption of the probe field. In addition, an efficient control over the polarization state of the probe field in the system can also be easily realized.
量子光学 电磁感应透明 法拉第旋转 270.1670 Coherent optical effects 270.4180 Multiphoton processes 260.1440 Birefringence 260.5430 Polarization Chinese Optics Letters
2007, 5(1): 47
