非互易多色辐射：双电-磁时空调制超收发器

中文摘要 AI 辅助

时间调制超表面提供了一条无磁体的非互易波控制途径，但现有实现仅调制结构的电响应，而同时进行电-磁调制的方案迄今仍停留在理论层面。我们实验演示了一种时空周期超收发器，其omega拓扑单元通过单向行波偏置独立且同时调制电表面磁化率和磁表面磁化率。这种双重调制产生了两种独立的、实验可分辨的非互易性表现：在发射模式下，入射场被高效转换为多色谐波梳，这些谐波以不同的、可随偏置重构的角度辐射；而在接收模式下，相同的调制反而抑制频率转换，并将入射波优先导向两个端口中的一个。这两种效应——非互易多色转换和单向波路由——源于单一的单向时空调制，但分别作用于不同的物理可观测量：频率内容和空间方向。我们的结果确立了同时电-磁时空调制作为一种可重构、全双工非互易波变换的实验可行机制。

英文摘要

Time-modulated metasurfaces offer a magnet-free route to nonreciprocal wave control, but existing realizations modulate only the electric response of the structure, and proposals for simultaneous electric-magnetic modulation have so far remained theoretical. We experimentally demonstrate a space-time-periodic meta-transceiver whose omega-topology unit cell independently and simultaneously modulates the electric and magnetic surface susceptibilities via a unidirectional traveling-wave bias. This dual modulation gives rise to two independent, experimentally resolved manifestations of nonreciprocity: on transmit, the incident field is efficiently converted into a polychromatic comb of harmonics that radiate at distinct, bias-reconfigurable angles, while on receive, the same modulation instead suppresses frequency conversion and routes the incoming wave preferentially toward one port over the other. These two effects, nonreciprocal polychromatic conversion and unidirectional wave routing, arise from a single unidirectional space-time modulation but act on distinct physical observables, frequency content and spatial direction, respectively. Our results establish simultaneous electric-magnetic space-time modulation as an experimentally viable mechanism for reconfigurable, full-duplex nonreciprocal wave transformation.

发表机构

• School of Electronics and Computer Science, University of Southampton（南安普顿大学电子与计算机科学学院）

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