Evidence of a broadband gap in a phononic crystal strip

Etienne Coffy; Sebastien Euphrasie; Mahmoud Addouche; Pascal Vairac; Abdelkrim Khelif

doi:10.1016/j.ultras.2017.03.003

Evidence of a broadband gap in a phononic crystal strip

Etienne Coffy, Sebastien Euphrasie, Mahmoud Addouche, Pascal Vairac, Abdelkrim Khelif

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)

Abstract

We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450 kHz to 1250 kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35 dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure. In particular, the role of the thin layer of epoxy is studied and is shown to have a strong influence on the dispersion. This phononic structure with a very large band gap can be considered as a new tool to design acoustic devices with high performances. (C) 2017 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	51-56
Number of pages	6
Journal	Ultrasonics
Volume	78
DOIs	https://doi.org/10.1016/j.ultras.2017.03.003
Publication status	Published - Jul 2017
Externally published	Yes

Keywords

Large band gap
Local resonances
Phononic strip

Access to Document

10.1016/j.ultras.2017.03.003

Cite this

@article{ada7248e88844910abad3f4c42cdb469,

title = "Evidence of a broadband gap in a phononic crystal strip",

abstract = "We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450 kHz to 1250 kHz, which corresponds to a gap-to-midgap ratio of 94\%, and the attenuation exceeds 35 dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure. In particular, the role of the thin layer of epoxy is studied and is shown to have a strong influence on the dispersion. This phononic structure with a very large band gap can be considered as a new tool to design acoustic devices with high performances. (C) 2017 Elsevier B.V. All rights reserved.",

keywords = "Large band gap, Local resonances, Phononic strip",

author = "Etienne Coffy and Sebastien Euphrasie and Mahmoud Addouche and Pascal Vairac and Abdelkrim Khelif",

year = "2017",

month = jul,

doi = "10.1016/j.ultras.2017.03.003",

language = "English",

volume = "78",

pages = "51--56",

journal = "Ultrasonics",

issn = "0041-624X",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - Evidence of a broadband gap in a phononic crystal strip

AU - Coffy, Etienne

AU - Euphrasie, Sebastien

AU - Addouche, Mahmoud

AU - Vairac, Pascal

AU - Khelif, Abdelkrim

PY - 2017/7

Y1 - 2017/7

N2 - We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450 kHz to 1250 kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35 dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure. In particular, the role of the thin layer of epoxy is studied and is shown to have a strong influence on the dispersion. This phononic structure with a very large band gap can be considered as a new tool to design acoustic devices with high performances. (C) 2017 Elsevier B.V. All rights reserved.

AB - We experimentally demonstrate a very large ultrasonic band gap in a one-dimensional phononic crystal. The structure consists of periodic tungsten pillars fixed to a tailored silicon strip with a layer of epoxy. Combining local resonances and Bragg scattering, the gap ranges from 450 kHz to 1250 kHz, which corresponds to a gap-to-midgap ratio of 94%, and the attenuation exceeds 35 dB with only three periods. Numerical calculations with the Finite Element Method are performed to support the analysis and provide a better understanding of the behavior of the structure. In particular, the role of the thin layer of epoxy is studied and is shown to have a strong influence on the dispersion. This phononic structure with a very large band gap can be considered as a new tool to design acoustic devices with high performances. (C) 2017 Elsevier B.V. All rights reserved.

KW - Large band gap

KW - Local resonances

KW - Phononic strip

UR - https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=hbku_researchportal&SrcAuth=WosAPI&KeyUT=WOS:000401042900007&DestLinkType=FullRecord&DestApp=WOS_CPL

U2 - 10.1016/j.ultras.2017.03.003

DO - 10.1016/j.ultras.2017.03.003

M3 - Article

C2 - 28319820

SN - 0041-624X

VL - 78

SP - 51

EP - 56

JO - Ultrasonics

JF - Ultrasonics

ER -

Evidence of a broadband gap in a phononic crystal strip

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this