Observation of Dyakonov Surface Waves
Observation of Dyakonov Surface Waves
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DOI：
10.1103/physrevlett.102.043903
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发表时间：
2009-06
期刊：
影响因子：
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通讯作者：
O. Takayama;L. Crasovan;D. Artigas;L. Torner
中科院分区：
文献类型：
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作者：
O. Takayama;L. Crasovan;D. Artigas;L. Torner
M. I. Dyakonov在1988年[1]。在透明各向异性材料的界面上，这种波在特殊条件下存在，并且是无损耗的。这种表面波要求两种介质中至少有一种是各向异性介质，双轴或正单轴，并且已经研究了各种配置[2]。在具有折射率nx、ny和nz的双轴各向异性介质和具有折射率nc的各向同性介质的界面的情况下，表面波仅在折射率满足条件n1 <$nc <$n2 <$n3时形成，（1）其中n1 = max（nx ; ny ; nz），n3 = min（nx ; ny ; nz），并且n2在n1和n3之间[3]。对于正单轴介质，条件变为ne_nc_nno，其中no和ne分别是寻常折射率和非常折射率。当满足这样的条件时，包含寻常场分量和非常场分量的混合表面波在相对于晶体光轴的窄角带Δθ内传播。允许的传播角度被称为角度存在域。
A special type of surface wave was predicted by M. I. Dyakonov in 1988 [1]. Such waves exist under special conditions at the interface of transparent anisotropic materials, and hens they are lossless. This surface waves require at least one of the two media to be an anisotropic medium, either biaxial or positive uniaxial, and various configurations have been investigated [2]. In the case of the interface of a biaxial anisotropic medium with refractive indices nx, ny and nz, and an isotropic medium with refractive indices nc, surface waves form only when the refractive indices fulfill the condition n1 ≫ nc ≫ n2 ≫ n3, (1) where n1 = max (nx ; ny ; nz), n3 = min (nx ; ny ; nz) and, n2 is in between n1 and n3[3]. For a positive uniaxial medium, the condition becomes ne ≫ nc ≫ no, where no and ne are the ordinary and extraordinary refractive indices, respectively. When such a condition is fulfilled, hybrid surface waves containing both ordinary and extraordinary field components propagate within a narrow angular band, Δθ, with respect to the crystal optical axis. The allowed propagation angles are referred to as the angular existence domain.