非线性左右手媒质界面的Goos-H?nchen位移
Goos-H?nchen shift at interface of nonlinear left/right-handed media
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摘要: 由均匀平面电磁波在左右手媒质界面满足的切向边界条件出发，推导了电磁波由线性传统媒质入射到非线性左手媒质时波的传播特性。利用时间延迟的方法，给出全反射情况下媒质界面非线性Goos-Hnchen位移表达式。分析了非线性左手媒质界面的侧向位移随入射角及入射波电场强度的变化关系，发现入射波场强对传输特性起决定作用:当入射波电场小于临界场强时，调节入射场强可以控制相应的侧向位移；当入射波电场大于临界场强时，不再满足全反射条件，部分入射波透射到非线性介质中。波导中加入非线性介质不仅可以调节侧向位移的大小，且可以实现对入射波场强的控制。Abstract: Based on the tangential boundary conditions, the propagation characteristics of the electromagnetic wave incident from a linear conventional medium(RHM) into a nonlinear left-handed medium(LHM) are derived in detail. The nonlinear Goos-Hnchen shift of total reflection at the interface of nonlinear left-handed medium is obtained using the phase-change approach. The dependence of the lateral shift on the incident angle and incident field intensity is analyzed. It is found that the incident field intensity plays an important role in the propagation of the electromagnetic wave. If the incident field intensity is lower than critical field intensity, the lateral shift can be regulated through the change of the incident field intensity, else if the incident field intensity is larger than cr
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