原子晶格中基于自发辐射相干效应的光子带隙  

Photonic Bandgap Based on Spontaneously Generated Coherence in Atomic Lattices

作　　者：巴诺[1] 王磊[2] 吴向尧[1] 李东飞[1] 王丹[1] 严立云[1] 

机构地区：[1]吉林师范大学物理学院,吉林四平136000 [2]吉林大学物理学院,吉林长春130012

出　　处：《光学学报》2014年第11期301-307,共7页Acta Optica Sinica

基　　金：国家自然科学基金(11347137;11247201;11374126);吉林师范大学博士项目(2011022)

摘　　要：利用电磁感应透明技术,在一维光晶格中相干驱动四能级Lambda模型冷原子系统,从而实现动力学可调谐电磁感应光子带隙结构。基于两邻近能级间的自发辐射相干(SGC)效应,通过控制耦合场从远共振到共振,使该原子系统实现从两个光子带隙转变为三个光子带隙的动态过程。当自发辐射相干效应不存在时,在探测场共振区域处探测光子被原子系统强烈吸收,因此感应光子带隙严重形变甚至无法形成。通过数值计算证明光子带隙结构的形成源自于自发辐射相干效应下探测场和耦合场之间的三阶交叉克尔(Kerr)非线性调制,并且通过控制耦合场的耦合方式,可以实现系统从两个光子带隙到三个光子带隙的动力学调控。Dynamically controlled photonic bandgap （PBG） is achieved via the electromagnetically induced transparency （EIT） in the one dimensional optical lattices filled with cold atoms driven to the four-level Lambda configuration with spontaneously generated coherence （SGC）. When the coupling field is far away from resonance or resonant, two or three well-developed photonic bandgaps can be induced based on spontaneously generated coherence from the two decay pathways. While in the absence of SGC, the probe field is absorbed by the medium, so the PBG around the probe resonance is severely malformed or even cannot be generated. Numerical calculations show that the induced PBG results from the Kerr nonlinear modulation between the probe and coupling field, and by controlling the detunings of coupling field, the two PBGs can be dynamically tuned into three PBGs in this system.

关 键 词：量子光学 电磁感应透明 克尔非线性 光子带隙 

分 类 号：O431.2[机械工程—光学工程]