左手介质中涡旋电磁波束的涡旋特性研究  

Study on Vortex Property of Rotating Beams in Left- handed Materials

作　　者：吕强 孙亨利 

机构地区：[1]通信网信息传输与分发技术重点实验室,河北石家庄050081

出　　处：《无线电工程》2014年第8期59-62,共4页Radio Engineering

摘　　要：基于建立左手介质中涡旋波束传输特性分析模型的目的,研究了涡旋波束在左手介质中的电磁传输特性。理论证明,左手介质中的逆古伊相移导致涡旋波束的横向场和相应相位旋转方向发生反转,而负的磁导率导致波束横向能流反转。此外发现,当考虑左手介质的损耗特性时,波束的角动量密度方向可以平行或反平行于横向能流方向,而忽略左手介质的损耗时,角动量密度方向始终反平行于横向能流方向。To establish the analytic model on rotating beam propagation behavior in left-handed materials （LHMs）,the vortex property of rotating beam in LHMs is studied.It is demonstrated theoretically that the negative Gouy-phase shift of rotating beam causes a reversed rotation of the corresponding phase,and ultimately leads to a reversed rotation of transverse intensity pattern.Furthermore,the negative magnetic permeability leads to an inverse spiral of transverse energy flow.In addition,it is found that the angular momentum density of the rotating beam in a lossy LHM may be parallel or antiparallel to the transverse energy flow.While it is always opposite to the transverse energy flow in a lossless LHM.

关 键 词：左手介质 涡旋波束 横向能流 角动量密度 

分 类 号：O441.4[理学—电磁学]