非单色光照明下的色散圆柱形斗篷
Dispersive Cylindrical Cloaks under Non-Monochromatic Illumination
摘要：
基于变换的圆柱形斗篷和聚光器用非单色波照明，观察到具有有趣的潜在应用的不寻常效果。用时域有限差分法对器件的瞬态响应进行了数值研究，并用解析公式对结果进行了验证。我们计算了几种隐身方案的有效带宽以及损耗对结构性能的影响。我们还发现，窄带行为，频移效应，时间延迟和空间干扰的入射波是占主导地位的，由于固有的色散性质的设备。这些影响很重要，在设计基于超材料的设备时应该考虑在内。
英文摘要：
Transformation-based cylindrical cloaks and concentrators are illuminated with non-monochromatic waves and unusual effects are observed with interesting potential applications. The transient responses of the devices are studied numerically with the Finite-Difference Time-Domain method and the results are verified with analytical formulas. We compute the effective bandwidth of several cloaking schemes as well as the effect of losses on the performance of the structures. We also find that narrowband behavior, frequency shift effects, time delays and spatial disturbances of the incoming waves are dominant due to the inherently dispersive nature of the devices. These effects are important and should be taken into account when designing metamaterial-based devices.
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