平面波在真空与负相速介质周期性波纹边界上的衍射
Planewave diffraction at the periodically corrugated boundary of vacuum and a negative phase-velocity material
摘要：
考虑平面波通过周期性波纹半空间的衍射问题，我们证明了折射介质由正/负相速度型向负/正相速度型的转变对衍射效率的影响。这种效应随着波纹深度的增加而增加，这是由于波纹界面的波谷中存在倏逝波。
英文摘要：
Considering the diffraction of a plane wave by a periodically corrugated half-space, we show that the transformation of the refracting medium from positive/negative phase-velocity to negative/positive phase-velocity type has an influence on the diffraction efficiencies. This effect increases with increasing corrugation depth, owing to the presence of evanescent waves in the troughs of the corrugated interface.
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