Negative refraction: An intrinsic property of uniaxial crystals
Negative refraction: An intrinsic property of uniaxial crystals
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DOI：
10.1103/physrevb.72.113111
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发表时间：
2005-09-01
影响因子：
3.7
通讯作者：
Zhang, DF
中科院分区：
文献类型：
--
作者：
Chen, XL;He, M;Zhang, DF
我们从理论和实验上证明，通过使晶体的光轴与入射光的法线成一定角度θ（0），可以在常规单轴晶体表面实现负折射。负折射的概念可以推广到所有单轴晶体的本征性质。结果表明，当tan（2）θ（0）=n（0）/n（e）时，入射光产生负折射的角度范围达到最大值，该值仅取决于两个折射率垂线n（e）-n（0）垂线之差。对正单轴晶YVO_4和负单轴晶方解石（CaCO_3）的实验结果与计算值符合得很好。应该注意的是，这里报道的负折射与超材料或光子晶体中发生的不同之处在于，传统晶体中的光k的波矢不会与电磁场E和H形成左手三重态。
We theoretically and experimentally show that negative refraction can be realized at the surface of conventional uniaxial crystals by orientating the crystals with their optic axes at a certain angle theta(0) to the normal of the light incoming surface. The concept of negative refraction can be extended to be an intrinsic property of all uinaxial crystals. It is revealed that the angular range for incident light to yield negative refraction attains its maximum that only depends on the difference of two indices of refraction vertical bar n(e)-n(0)vertical bar when tan(2) theta(0)=n(0)/n(e). The careful experiments on positive uniaxial crystal YVO4 and negative unaxial crystal calcite (CaCO3) give results in good agreement with the calculated ones. It should be noted that the negative refraction reported here differs from that occurring in metamaterials or photonic crystals in that the wave vector of light k in conventional crystals does not form a left-handed triplet with electromagnetic field E and H.