调控电磁感应透明气体折射率实现可控光子带隙结构  

Controlling the photonic bandgap structures via manipulation of refractive index of electromagnetically induced transparency vapor

作　　者：庄飞[1] 沈建其[2] 叶军[1] 

机构地区：[1]杭州师范学院理学院凝聚态物理研究所,杭州310036 [2]浙江大学(紫金港校区)

出　　处：《物理学报》2007年第1期541-545,共5页Acta Physica Sinica

基　　金：浙江省自然科学基金(批准号:Y404355);浙江省教育厅配套项目(批准号:0424XP15);国家自然科学基金(批准号:10604046)资助的课题~~

摘　　要：提出了电磁感应透明(EIT)介质的一个新的相干操纵应用:控制电磁感应透明气体折射率实现可控光子带隙结构.将一定密度的EIT原子气体充入以砷化钾为背景的椭圆孔柱中,计算表明该三角晶格排列椭圆柱光子晶体的光子带隙随外控制场而变.通过调控自发辐射率、无辐射衰变率、控制光Rabi频率、原子数密度等外参数以及椭圆结构几何参数,在高频率区域得到了大小约0·0503ωe(ωe=2πc/a)的完全光子带隙.A new application of coherent manipulation of Err （electromagnetically induced transparency） medium is suggested. A two- dimensional photonic cystal with a triangle lattice of elliptic air cylinders, which are filled with the Err atomic vapor, in the KAs baekgroud material is designed. By manipulating the refractive index of the Err vapor via the external control field, one can obtain the controllable bandgap structure that is sensitive to the variations of external conditions （e. g. the intensity of the control field）. It is shown that a large complete bandgap of about 0.0503ωe in the region of high normalized frequency could be achieved by choosing the specific parameters such as the spontaneous decay rate, dephasing rate, Rabi frequency of control light, atomic number density as well as elliptic geometric parameters.

关 键 词：电磁感应透明 可控光子带隙 光子晶体 量子相干原子气体 

分 类 号：O431.2[机械工程—光学工程]