论文标题
时空跨国的四维波变换
Four-Dimensional Wave Transformations By Space-Time Metasurfaces
论文作者
论文摘要
静态跨膜已证明是空间中电磁波的相互和频率转化的突出紧凑结构。但是，将时间变化纳入静态跨面将导致动态设备，这些设备能够对电磁波的空间和时间特性进行四维剪裁，从而导致功能远远超出了常规静态元素的能力。这包括非重新磁全双工波传输，纯频率转换，参数波扩增，时空分解和时空波衍射。本文回顾了时空元信息为打破互惠提供的最新进展和机会，揭示了它们对低能量，紧凑，集成的非重点设备和子系统的潜力，并讨论了这一令人兴奋的研究方面的未来。
Static metasurfaces have shown to be prominent compact structures for reciprocal and frequency-invariant transformation of electromagnetic waves in space. However, incorporating temporal variation to static metasurfaces would result in dynamic apparatuses which are capable of four-dimensional tailoring of both the spatial and temporal characteristics of electromagnetic waves, leading to functionalities that are far beyond the capabilities of conventional static metasurfaces. This includes nonreciprocal full-duplex wave transmission, pure frequency conversion, parametric wave amplification, spatiotemporal decomposition, and space-time wave diffraction. This paper reviews recent progress and opportunities offered by space-time metasurfaces to break reciprocity, revealing their potential for low-energy, compact, integrated non-reciprocal devices and sub-systems, and discusses the future of this exciting research front.
