连续变化时间介质辅助超宽带增透
Ultra-wideband Antireflection Assisted by Continuously Varying Temporal Medium
摘要：
我们证明，电磁波在两种不同的材料之间的无反射传播可以通过设计一个中间的时间介质，它可以工作在一个超宽的频带。这种时间介质的设计考虑了材料的介电常数在时域中的多级变化。多级时间介电常数由级联的四分之一波长时间涂层形成，这是Pacheco-Peña等人[[1] Optica 7，323（2020）]的时间涂层的扩展。对超宽带时空介质的绘制策略进行了理论分析和数值验证。深入分析表明，时间介质的多阶段设计意味着材料本构参数的连续时间变化，从而合理地获得了超宽带减反射时间介质。作为一个应用实例，本文提出的时域介质被用于实现介质平板与自由空间之间的阻抗匹配，验证了我们的新发现。
英文摘要：
We demonstrate that reflectionless propagation of electromagnetic waves between two different materials can be achieved by designing an intermediate temporal medium, which can work in an ultra-wide frequency band. Such a temporal medium is designed with consideration of a multi-stage variation of the material' s permittivity in the time domain. The multi-stage temporal permittivity is formed by a cascaded quarter-wave temporal coating, which is an extension of the antireflection temporal coating by Pacheco-Peña et al [[1] Optica 7, 323 (2020)]. The strategy to render ultra-wideband antireflection temporal medium is discussed analytically and verified numerically. In-depth analysis shows that the multi-stage design of the temporal media implies a continuously temporal variation of the material' s constitutive parameters, thus an ultra-wideband antireflection temporal medium is reasonably obtained. As an illustrative example for application, the proposed temporal medium is adopted to realize impedance matching between a dielectric slab and free space, which validates our new findings.
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