Ultrasonic metamaterials with negative modulus

被引:1676
作者
Fang, Nicholas [1 ]
Xi, Dongjuan [1 ]
Xu, Jianyi [1 ]
Ambati, Muralidhar [1 ]
Srituravanich, Werayut [1 ]
Sun, Cheng [1 ]
Zhang, Xiang [1 ]
机构
[1] Univ Calif Berkeley, Nanoscale Sci & Engn Ctr, Berkeley, CA 94720 USA
关键词
D O I
10.1038/nmat1644
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The emergence of artifcially designed subwavelength electromagnetic materials, denoted metamaterials(1-10), has significantly broadened the range of material responses found in nature. However, the acoustic analogue to electromagnetic metamaterials has, so far, not been investigated. We report a new class of ultrasonic metamaterials consisting of an array of subwavelength Helmholtz resonators with designed acoustic inductance and capacitance. These materials have an effective dynamic modulus with negative values near the resonance frequency. As a result, these ultrasonic metamaterials can convey acoustic waves with a group velocity antiparallel to phase velocity, as observed experimentally. On the basis of homogenized-media theory, we calculated the dispersion and transmission, which agrees well with experiments near 30 kHz. As the negative dynamic modulus leads to a richness of surface states with very large wavevectors, this new class of acoustic metamaterials may offer interesting applications, such as acoustic negative refraction and superlensing below the diffraction limit.
引用
收藏
页码:452 / 456
页数:5
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