用惠更斯作图法讨论单轴晶体中双波长双负折射现象  

Analysis of the double-negative refraction phenomenon for two wavelengths in the uniaxial crystals by using the Huygens construction

作　　者：刘丽敏[1] 崔博勋[1] 

机构地区：[1]北京化工大学理学院,北京100029

出　　处：《大学物理》2011年第3期59-61,共3页College Physics

摘　　要：近年的研究表明,在右手性的各向异性材料(如普通晶体)中一定条件下也会形成负折射,用惠更斯作图法可以清楚地说明普通单轴晶体中出现的这种情况.本文用惠更斯作图法说明在适当条件下,一束含有两种波长的光入射到单轴晶体中会出现双正折射、一正一负折射、双负折射等物理现象.以钒酸钇晶体为例,计算了发生负折射现象的临界入射角.本文的工作有利于在教学中介绍左手材料及负折射现象时,给予学生正确全面的认识.The recent research shows that in right-hand anisotropic materials（such as common crystals） the negative refraction will also be taken under certain condition.It can be explained using the Huygens construction.In this paper the Huygens construction is used to elucidate that the double-positive,one positive-one negative,double-negative refraction may occur in the uniaxial crystals for a light beam including two wavelengths under the appropriate condition.The critical angle of incidence for occurrence neganve refraction is calculated for YVO4 crystal.This is beneficial for the students getting a right overall understanding while the left-handed materials and the negative refraction phenomenon are introduced in the teaching.

关 键 词：惠更斯作图 单轴晶体 双波长 负折射 

分 类 号：O482.2[理学—固体物理]