Asymmetric transmission of surface plasmon polaritons on planar gratings
Asymmetric transmission of surface plasmon polaritons on planar gratings
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DOI：
10.1103/physreva.92.053813
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发表时间：
2015-11-05
影响因子：
2.9
通讯作者：
Maradudin, A. A.
中科院分区：
文献类型：
--
作者：
Kuzmiak, V.;Maradudin, A. A.
我们描述了由金属-空气界面组成的表面结构，其中金属部分由两个金属段组成，并且它们之间的界面进行周期性调制。这种结构对于从其一侧入射到其上的表面等离子体激元极化子具有与从相对侧入射到其上的表面等离子体激元极化子不同的透射率。表面等离子体激元的这种不对称传输基于对零级布拉格光束的抑制，对于一定的调制深度值，零级布拉格光束不会传输通过结构，而+1和-1布拉格光束的衍射效率可以通过改变光栅周期和/或入射角来修改。对于一定范围的入射角，可以观察到-1模式的透射率不对称，而+1模式则被完全抑制。通过改变衍射结构的材料和几何参数，人们可以控制表征不对称程度的对比度透射。计算机模拟计算的结果证明了该结构的这一特性。
We describe a surface structure consisting of a metal-air interface where the metallic part consists of two metallic segments with a periodic modulation of the interface between them. Such a structure possesses a different transmissivity for a surface plasmon polariton incident on it from one side of it than it has for a surface plasmon polariton incident on it from the opposite side. This asymmetric transmission of a surface plasmon polariton is based on the suppression of the zero-order Bragg beam which, for a certain value of the modulation depth, is not transmitted through the structure, while the diffraction efficiencies of the +1 and -1 Bragg beams can be modified by varying the period of the grating and/or the angle of incidence. For a certain range of the incidence angle one can observe asymmetry in transmittance for the -1 mode, while the +1 mode is completely suppressed. By varying the material and geometrical parameters of the diffractive structure one can control the contrast transmission that characterizes the degree of the asymmetry. This property of the structure is demonstrated by the results of computer simulation calculations.