负折射率介质中能流传输研究  

Power flow propagation in media with negative refractive

作　　者：廖腊梅[1] 严祥安[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710062

出　　处：《陕西师范大学学报（自然科学版）》2005年第2期40-43,共4页Journal of Shaanxi Normal University：Natural Science Edition

基　　金：陕西省自然科学基金资助项目(2003A08)

摘　　要：研究了平面电磁波从各向同性且均匀的右手介质(ε(ω)>0,μ(ω)>0)透射到各向同性且均匀色散的左手介质中(ε(ω)<0,μ(ω)<0)的传播规律.通过场和坡印亭矢量的表达式,计算了坡印亭矢量对时间的平均值.从能流的角度,证明了电磁波从右手介质进入左手介质中时电磁波是以负角度折射的,并进一步推算了在Drude介质中的群速度,证实了群速度vg(ω)>0.The transmission at a boundary between a right-handed medium (RHM:ε(ω)>0,μ(ω)>0) and a frequency dispersive left-handed medium (LHM:ε(ω)<0,μ(ω)<0 for some ω), both homogeneous and isotropic are expounded, and offers explicit expressions for the time-domain fields and time-averaged Poynting vectors. From the direction of power flow vectors it is proved that waves refract at negative angles at a RHM-LHM interface, and the expression is obtained for group velocity in Drude medium, which verifies v_g(ω)>0.

关 键 词：左手介质 右手介质 坡印亭矢量 

分 类 号：O437.2[机械工程—光学工程]