声学双曲构型超材料的负折射特性研究  

Negative Refraction Characteristics of Acoustic Hyperbolic Configuration Metamaterials

作　　者：刘松[1] 赵仁洁 杜一帆 吴芳 宋和滨 高鹏[3] LIU Song;ZHAO Renjie;DU Yifan;WU Fang;SONG Hebin;GAO Peng(State Key Laboratory of Structural Analysis,Optimization and CAE Software for Industrial Equipment,Dalian University of Technology,Dalian 116024,China;Dalian Shipbuilding Industry Company,Dalian 116011,China;China Classification Society(CCS)Dalian Branch,Dalian 116013,China)

机构地区：[1]大连理工大学工业装备结构分析优化与CAE软件全国重点实验室,大连116024 [2]大连船舶重工集团有限公司,大连116011 [3]中国船级社(CCS)大连分社,大连116013

出　　处：《人工晶体学报》2024年第2期246-251,共6页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51609037)。

摘　　要：声学双曲超材料是具有双曲色散特性的人工材料,具有极强的各向异性,其负折射特性是研究实现高分辨率聚焦型超透镜的理论依据。针对远场噪声源识别受制于0.5倍波长声波瑞利衍射识别分辨率问题,结合声学超材料对声波的优异调控效果,引进可以实现亚波长超分辨率成像的双曲超材料,利用其负折射特性设计了一种用于工作频率为2 271.5 Hz的声学双曲结构。分析了该构型的双曲结构色散特性及负折射特性,结果表明声波在该双曲超材料中传播的群速度方向垂直于波矢,并沿着色散曲线的法线方向。本文的研究为实现对声波和弹性波的任意调控,以及噪声源的聚焦定位、识别放大等提供了一定的设计参考。Acoustic hyperbolic metamaterials are artificial materials with hyperbolic dispersion characteristics and strong anisotropy.Their negative refractive properties are the theoretical basis for studying the implementation of high-resolution focused superlenses.In response to the problem that the recognition of far-field noise sources is limited by the resolution of 0.5 times wavelength acoustic Rayleigh diffraction recognition,combined with the excellent control effect of acoustic metamaterials on sound waves,a hyperbolic metamaterial that can achieve sub wavelength super-resolution imaging is introduced,and its negative refractive characteristics are used to design an acoustic hyperbolic structure for working at a frequency of 2271.5 Hz.The dispersion and negative refraction characteristics of the hyperbolic structure of this configuration were analyzed,and the results show that,the group velocity direction of sound waves propagating in this hyperbolic metamaterial is perpendicular to the wave vector and follows the normal direction of the dispersion curve.The research in this paper provides some design references for realizing arbitrary regulation of sound wave and elastic wave,as well as focusing,locating,identifying and amplifying noise sources.

关 键 词：声学超材料 声学透镜 弹性波带隙特性 负折射 双曲色散 声聚焦 

分 类 号：O735[理学—晶体学] TL375.2[核科学技术—核技术及应用]