时空菲涅耳棱镜
Space-Time Fresnel Prism
AI总结：
针对时空调制超材料相关结构需极大器件尺寸的难题，提出时空菲涅耳棱镜方案，通过周期重注调制实现等效非谐非互易频率转换，可拓展至多种调制场景，推动时空系统实用化。
摘要：
基于时空调制的超材料近来引发了广泛关注，这得益于其在介质参数中引入了时间维度这一根本性拓展，以及由此产生的新颖特性与潜在应用。然而，大多数相关结构——例如涉及阶跃、平板或梯度不连续性的结构——的实现受到了阻碍，因为它们需要无限大或尺寸大到难以实现的器件，这一要求无法满足。我们在此提出了该问题的一种解决方案，即对传统菲涅耳棱镜进行时空转置：将目标调制的副本周期性地重新注入经菲涅耳缩减的有限结构的输入端，从而在调制阶跃的情况下，实现与目标时空界面相同的非谐和非互易频率转换。这一概念可轻松拓展至平板或梯度调制，以及用于时空啁啾操作的加速分布，可为各类新型微波与光学时空系统的实际开发铺平道路。
英文摘要：
Space-time modulation-based metamaterials have recently spurred considerable interest, owing to the fundamental addition of the time dimension to the medium parameters, and resulting novel properties and potential applications. However, the implementation of most related structures -- e.g., involving step, slab or gradient discontinuities -- has been hindered by the impossible requirement of infinitely or prohibitively large device sizes. We provide here a solution to this issue, consisting in a space-time transposition of the conventional Fresnel prism, whereby a copy of the target modulation is periodically re-injected at the input of a Fresnel-reduced finite structure, so as to provide the same anharmonic and nonreciprocal frequency conversion as the target space-time interface in the case of a modulation step. This concept, which may readily extend to slab or gradient modulations, as well as accelerated profiles for space-time chirping operations, may pave the way for the practical development of a wide range of novel microwave and optical space-time systems.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
