超构表面的振幅调控及其功能器件研究进展

Research development of amplitude-modulated metasurfaces and their functional devices

超构表面是一种具有亚波长特征尺寸的人工平面结构材料,可以在亚波长尺度上对入射电磁波的振幅、相位、偏振、频率、光谱等参量进行精密且灵活的调控,近年来备受关注。振幅是光波的基本参量之一,本文将从振幅调控的角度出发,对基于超构表面材料的振幅调控机理进行分析,主要包括通过改变纳米结构的尺寸和方向角对振幅进行调控,同时对基于振幅调控超构表面的功能器件的研究现状及其应用场景进行总结和讨论。研究表明,振幅调控超构表面具有设计灵活、加工简单、功能强大、可与其他参量调控相融合等特点,其在高分辨率图像显示、高密度信息存储、信息加密、信息复用、光束整形、光信息处理和安全防伪等诸多领域具有重要的研究价值和广阔的应用前景。

Metasurfaces,a kind of artificial planar material with subwavelength feature sizes,have attracted much attention in recent years because they can precisely and flexibly manipulate the amplitude,phase,polarization,frequency and spectrum of incident electromagnetic waves at the subwavelength scale.Since amplitude is one of the fundamental properties of a lightwave,in this article,we focus on investigating the mechanism of amplitude-modulated metasurfaces.Amplitude modulation is carried out mainly by varying the sizes and orientation angles of nanostructures.In addition,the progress and applications of functional devices based on amplitude-modulated metasurfaces are summarized and discussed in detail.This article shows that amplitude-modulated metasurfaces have the advantages of flexible designs,simple fabrication,powerful functionality and are suitable for easily merging other optical property modulations.Amplitude-moderated metasurfaces have important research value and broad application prospects in the fields of high-resolution image display,high-density information storage,information encryption,information multiplexing,beam shaping,optical information processing,security,anticounterfeiting and many other related areas.