类涡旋表面波及其在超材料聚焦瞬态现象中的作用
Vortex-like surface wave and its role in the transient phenomena of meta-material focusing
摘要：
我们发现，一个平板的超材料（与$ε=μ=-1+iΔ$）具有涡旋状表面波没有能力传输能量，其性质是完全不同的本地化模式或驻波。通过计算的基础上严格的时间依赖格林函数的方法，我们证明，这样的模式不可避免地产生特征图像振荡，即使在二维聚焦与单色源，这是在许多数值模拟中观察到的，但这种振荡是弱的三维聚焦。
英文摘要：
We show that a slab of meta-material (with $ε=μ=-1+iΔ$) possesses a vortex-like surface wave with no ability to transport energy, whose nature is completely different from a localized mode or a standing wave. Through computations based on a rigorous time-dependent Green's function approach, we demonstrate that such a mode inevitably generates characteristic image oscillations in two dimensional focusing with even a monochromatic source, which were observed in many numerical simulations, but such oscillations are weak in three dimensional focusing.
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