二维人工超材料的光学拓扑性质

Optical topological characteristics of two dimensional artificial metamaterials

以超表面为代表的二维人工超材料通过其亚波长单元增强光与物质的相互作用,进而操控光的振幅、相位、偏振、轨道角动量等物理量。目前,非平凡拓扑性质的二维人工超材料由于具有鲁棒的光单向传输等性质成为了光学领域的研究重点。拓扑相不仅成为了凝聚态物理领域一种描述物质的新的自由度,也成为描述人工超材料光学性质的一个新的参量。本文从拓扑光子学的起源出发,介绍了二维人工超材料的拓扑性质分类以及最新的拓扑光子学研究进展,并进行了总结与展望。

Two dimensional artificial metamaterials, represented by metasurfaces, could control the amplitude, phase, polarization and orbital angular momentum of light, through tailoring the interaction between light and matter. Nowadays, two dimensional artificial metamaterials with nontrivial topological properties have become research focus in optics due to their advantages in robust unidirectional transmission. The topological phase is not only a new degree of freedom to describe matter in the field of condensed matter physics,but also a new parameter to describe optical properties of artificial metamaterials. In this review, the origin of topological photonics and classification for topological properties of two dimensional metamaterials are introduced. The latest progress in topological photonics has also been presented. The summary and prospect of topological metamaterials are given at the end of the review.