基于悬链线结构的多功能二向色性超构表面

Multifunctional dichroic metasurface based on catenary structure

摘要:

超构表面是一种由亚波长单元结构组成的人工表面，展现出巨大的电磁波操纵潜力，悬链线电磁学为超构表面的设计提供了新的思路和方法。本文提出一种基于悬链线结构的多功能二向色性超构表面，能够在不同方向上实现对电磁波的选择吸收。仿真结果显示，该器件可在红外区域实现92%的线性二色性(LD)和96%的圆二色性(CD)。这两种功能仅需改变电磁波的入射方向就可同时实现，且两种功能在一定入射角范围内均具有较高的效率。此外，还分析了不同几何参数对吸收性能的影响，以及实现不同电磁波选择吸收的物理机制。该超构表面具有结构简单、便于集成以及应用范围广的优点，在成像、传感和光谱等领域具有潜在的应用前景。

Abstract:

Metasurfaces are artificial surfaces composed of sub-wavelength unit structures, demonstrating tremendous potential for manipulating electromagnetic waves. Catenary electromagnetics provides new ideas and methods for the design of metasurfaces. This paper proposes a multifunctional dichroic metasurface based on a catenary structure, capable of selectively absorbing electromagnetic waves in different directions. Simulation results show that the device can achieve 92% Linear Dichroism (LD) and 96% Circular Dichroism(CD) in the infrared region. Both functions can be realized simultaneously by merely changing the incident direction of the electromagnetic waves, and both functions have high efficiency within a certain range of incident angles. In addition, the influence of different geometric parameters on the absorption performance is analyzed, as well as the physical mechanisms for selective absorption of different electromagnetic waves. This metasurface has the advantages of simple structure, easy integration, and a wide range of applications, and has potential application prospects in the fields of imaging, sensing, and spectroscopy.