Polarization State Conversion Achieved by Chiral Mechanical Metamaterial

Hicham Mangach, Younes Achaoui, M. Kadic, Abdenbi Bouzid, S'ebastien Guenneau, Shuwen Zeng
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Abstract

Chiral metamaterials have paved the way for progress in wave propagation and polarization control. In particular, chiral elastic metamaterials attracted considerable scientific attention due to their distinctive properties such as acoustical activity and auxeticity. Such characteristics arise from additional degrees of freedom for tuning the embedded micro- and macro-rotations. Herein, we use 3D chiral mechanical metamaterials to realize the polarization state conversion functionnality. A structural design of a 3D chiral metamaterial capable to induce up to 90° rotation in the plane of polarization is presented. This feature enables a straightforward switch between the three polarization states existing within a solid material, namely, longitudinal state, shear horizontal state, and shear vertical state. Efficient conversion from longitudinal movement to transverse movement is demonstrated. A discrete mass-spring model is proposed for these 3D chiral structures that describes the conversion behaviors based on the corresponding elastic coefficients. The engineered chiral metamaterial polarization converter is a promising device for efficient momentum conservation conversions. This allows converting longitudinal waves into shear waves while preserving the initial stimulating wave characteristics.
手性机械超材料实现的偏振态转换
手性超材料为波传播和偏振控制领域的发展铺平了道路。特别是,手性弹性超材料因其独特的特性(如声学活性和辅助性)而备受科学界关注。这些特性源于调整嵌入式微观和宏观旋转的额外自由度。在此,我们利用三维手性机械超材料来实现偏振态转换功能。本文介绍了一种三维手性超材料的结构设计,这种超材料能够在偏振平面上诱导高达 90° 的旋转。这一特性可实现固体材料中存在的三种偏振态(即纵向态、剪切水平态和剪切垂直态)之间的直接切换。演示了从纵向运动到横向运动的高效转换。针对这些三维手性结构提出了一个离散质量弹簧模型,该模型基于相应的弹性系数来描述转换行为。工程手性超材料偏振转换器是一种很有前途的高效动量守恒转换装置。它可以将纵波转换为剪切波,同时保留初始激励波的特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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