Extraordinary absorption of sound in porous lamella-crystals

被引：52

作者：

Christensen, J. ^{[1
,2
]}

Romero-Garcia, V. ^{[3
,4
]}

Pico, R. ^{[3
]}

Cebrecos, A.

Garcia de Abajo, F. J. ^{[5
,6
]}

Mortensen, N. A. ^{[2
]}

Willatzen, M. ^{[2
]}

Sanchez-Morcillo, V. J. ^{[3
]}

机构：

[1] Univ Southern Denmark, Inst Technol & Innovat, DK-5230 Odense, Denmark

[2] Tech Univ Denmark, Dept Photon Engn, DK-2800 Lyngby, Denmark

[3] Univ Politecn Valencia, Inst Invest n Gest Integrada Zonas Costeras, Gandia 46730, Spain

[4] LUNAM Univ, Univ Maine, CNRS, LAUM UMR 6613, F-72085 Le Mans, France

[5] ICFO Inst Ciencies Foton, Barcelona 08860, Spain

[6] ICREA, Barcelona 08010, Spain

来源：

SCIENTIFIC REPORTS | 2014年 / 4卷

关键词：

METAMATERIALS; REFLECTION; LIGHT;

D O I：

10.1038/srep04674

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

We present the design of a structured material supporting complete absorption of sound with a broadband response and functional for any direction of incident radiation. The structure which is fabricated out of porous lamellas is arranged into a low-density crystal and backed by a reflecting support. Experimental measurements show that strong all-angle sound absorption with almost zero reflectance takes place for a frequency range exceeding two octaves. We demonstrate that lowering the crystal filling fraction increases the wave interaction time and is responsible for the enhancement of intrinsic material dissipation, making the system more absorptive with less material.

引用

页数：5

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