Metasurfaces have exhibited great capabilities to control electromagnetic waves, and many multifunctional metasurfaces were recently proposed. However, although angle-multiplexed meta-devices were successfully realized in reflection geometries, their transmission-mode counterparts are difficult to achieve due to the additional requirements. Here, we design and fabricate a transmissive angle-multiplexed meta-polarizer in the microwave regime based on a multilayer metasurface. Coupled-mode-theory analyses reveal that the device exhibits distinct angle-dependent transmissive responses under excitations with different polarizations, and such differences are further enhanced by multiple scatterings inside the device. Microwave experimental results are in good agreement with numerical simulations and theoretical analyses.

近年来，纳米光学体系中共振体间耦合引起了人们的广泛关注。相对于单一光子共振结构体系，由多个光子共振体组成的复杂耦合体系有着更大的调控自由度和更令人着迷的现象。然而，相比人们在实验方面取得的进步，对于耦合问题的理论描述仍远未令人满意。本文从少体问题到周期性超构表面，从光子封闭体系到开放体系，系统介绍了多种处理共振体间耦合的理论工具，以及如何利用这些工具设计具有特定电磁波调控功能的新型超构表面。本文将着重展示本研究团队近些年在这一领域的研究进展，为相关领域研究人员提供指引与参考。

The linear angular dispersion of a self-diffraction (SD) pulse, from a femtosecond laser pulse cleaning device, is compensated for by the use of a single prism. More than $500~\unicode[STIX]｛x03BC｝\text｛J｝$ first-order SD pulse has a contrast of $10^｛12｝$, which is about five orders of magnitude improvement from the input fundamental pulse. The wings of the distribution away from the main pulse in $\pm 1$ ps are cleaned with a contrast improvement of about $10^｛7｝$, which verifies the pulse cleaning ability of the SD process.