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一种基于开口空心球的声学超材料
  • 期刊名称：物理学报，2011, 60(4): 044301
  • 时间：0
  • 分类：TN911.72[电子电信—通信与信息系统;电子电信—信息与通信工程]
  • 作者机构：[1]西北工业大学应用物理系,西安710129
  • 相关基金：国家自然科学基金（批准号：50632030 50872113 50936002）资助的课题
  • 相关项目：光波段左手超材料的"由下而上"膜板组装制备
关键词： 开口空心球(SHS), 声学超材料, 吸收峰, 等效弹性模量, split hollow sphere（SHS）, acoustic metamaterial, transmission dip, effective modulus
中文摘要：

提出了一种基于局域共振的开口空心球（spilt hollow spheres,SHS）模型,数值计算和声学透射实验结果表明基于该模型的声学超材料可以实现负的弹性模量.为了说明SHS的局域共振性质,研究了微结构SHS几何尺寸（例如开口孔径d和空心球直径D）变化时材料的透射性质,结果表明SHS的几何尺寸的改变对声学超材料的透射吸收峰频率有显著影响.另外,还研究了SHS不同排列方式对透射行为的影响,发现单层样品中SHS单元数目以及晶格常数的变化不会引起谐振频率的变化,但是随着SHS单元数目或者样品排列层数的增加,材料的谐振强度可以得到明显增强.

英文摘要：

We propose an acoustic metamaterial（AM） composed of local resonant split hollow sphere（SHS）.The results of numerical simulation and acoustic experiment show that the effective modulus of the AM with SHS is negative.To further investigate the intrinsic resonant mechanism of the SHS,we study the transmission of the AM by adjusting the geometry sizes of the SHS,such as the diameter of split hole and the diameter of hollow sphere.It is found that the geometry sizes of SHS will greatly affect the frequency of transmission dip,say,the resonant frequency.Moreover,we investigate the effects of the arrangement in AM on transmission feature.When the lattice constant and the number of SHSs change,the frequency range of resonance in the single-layer AM keeps unchanged.However,the resonant intensity of AM becomes stronger with the increase of the number of SHSs in single layer and the number of SHS layers.

同期刊论文项目
左手材料的设计、制备和物理效应研究
期刊论文 230 获奖 2
光波段左手超材料的"由下而上"膜板组装制备
期刊论文 45
多因素耦合作用下微/纳尺度热辐射特性及传输机理研究
期刊论文 99 会议论文 31 专利 10
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