光脉冲通过含有色散与增益型缺陷的一维光子晶体的传播  

Propagation of optical pulses through one-dimensional photonic crystals with a dispersive and gain defect layer

作　　者：于天宝[1] 刘念华[1] 

机构地区：[1]南昌大学物理系,南昌330047

出　　处：《物理学报》2004年第9期3049-3053,共5页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :60 2 680 0 1);江西省自然科学基金 (批准号 :0 3 12 0 0 4);南昌大学基础理论基金资助的课题~~

摘　　要：研究了光脉冲通过含有色散和增益型缺陷的一维光子晶体的传播行为 .缺陷的色散与增益性质用Lorentz振子模型描述 .随着振子强度的变化 ,脉冲峰的传播呈现极慢光速和超光速的传播行为 ,但能量速度小于真空中的光速c.The propagation of a pulse through one dimensional photonic crystals with a dispersive and gain defect layer is discussed. The dispersion and gain of the defect layer is described by Lorentz oscillator model. It is found that the pulse peak exhibits subluminal and superluminal behaviors with varying strength of the oscillator. The Poynting vector and energy velocity can be negative, but the latter is never faster than the vacuum light speed c . The advance or delay of the pulse peak is a result of the coherent superposition of all Fourier components which experienced different phase shift and different amplification in the medium.

关 键 词：光子晶体 光脉冲传播 能量速度 色散 增益 晶体缺陷 振子强度 

分 类 号：O436[机械工程—光学工程]