Negative Goos-Hänchen shift in reflection from subwavelength gratings
Negative Goos-Hänchen shift in reflection from subwavelength gratings
复制标题
亚波长光栅反射的负古斯-汉欣位移
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
K. Staliūnas
中科院分区：
文献类型：
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作者：
Yu;K. Staliūnas
抽象的。预测从由两个平行电介质亚波长衍射光栅组成的平面微光子结构反射的光束会出现负古斯-汉兴（GH）位移。出现这种现象是因为亚波长结构中引导的模式的能量流主要沿与入射光束的能量流相反的方向引导。数值计算表明，负GH位移可以达到实际结构中波长的大约六倍，因此可以通过实验观察到该现象。除了负横向偏移之外，还观察到从光栅反射的光束的聚焦作为次要效应。
Abstract. A negative Goos–Hänchen (GH) shift of light beam reflecting from planar microphotonic structures consisting of two parallel dielectric subwavelength diffraction gratings is predicted. The phenomenon occurs because the energy flow of the mode guided in the subwavelength structure is predominantly directed in the opposite direction to the energy flow of the incident beam. The numerical calculations show that the negative GH shift can reach approximately six times that of the wavelength in realistic structures, so that the phenomenon can be experimentally observed. In addition to the negative lateral shift, the focusing of the beam in reflection from the grating is also observed as a secondary effect.