Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses

Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses

This work deals with an analytical and numerical study of the focusing of the lowest order anti-symmetric Lamb wave in gradient index phononic crystals. Computing the ray trajectories of the elastic beam allowed us to analyze the lateral dimensions and shape of the focus, either in the...

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Main Authors: J. Zhao, B. Bonello, O. Boyko
Format: Article
Language:English
Published: AIP Publishing LLC 2014-12-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.4905436
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spelling doaj-c2541385ba1e4d1eb5cd9b28cea370d42020-11-24T21:29:46ZengAIP Publishing LLCAIP Advances2158-32262014-12-01412124204124204-1110.1063/1.4905436021497ADVBeam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lensesJ. Zhao0B. Bonello1O. Boyko2UPMC Univ Paris 06, UMR 7588, Institut des NanoSciences de Paris, F-75005, Paris, FranceCNRS, UMR 7588, Institut des NanoSciences de Paris, F-75005, Paris, FranceUPMC Univ Paris 06, UMR 7588, Institut des NanoSciences de Paris, F-75005, Paris, France This work deals with an analytical and numerical study of the focusing of the lowest order anti-symmetric Lamb wave in gradient index phononic crystals. Computing the ray trajectories of the elastic beam allowed us to analyze the lateral dimensions and shape of the focus, either in the inner or behind the phononic crystal-based acoustic lenses, for frequencies within a broad range in the first band. We analyzed and discussed the focusing behaviors inside the acoustic lenses where the focalization at sub-wavelength scale was achieved. The focalization behind the gradient index phononic crystal is shown to be efficient as well: we report on FMHM = 0.63λ at 11MHz. http://dx.doi.org/10.1063/1.4905436
collection DOAJ
language English
format Article
sources DOAJ
author J. Zhao
B. Bonello
O. Boyko
spellingShingle J. Zhao
B. Bonello
O. Boyko
Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
AIP Advances
author_facet J. Zhao
B. Bonello
O. Boyko
author_sort J. Zhao
title Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
title_short Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
title_full Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
title_fullStr Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
title_full_unstemmed Beam paths of flexural Lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
title_sort beam paths of flexural lamb waves at high frequency in the first band within phononic crystal-based acoustic lenses
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2014-12-01
description This work deals with an analytical and numerical study of the focusing of the lowest order anti-symmetric Lamb wave in gradient index phononic crystals. Computing the ray trajectories of the elastic beam allowed us to analyze the lateral dimensions and shape of the focus, either in the inner or behind the phononic crystal-based acoustic lenses, for frequencies within a broad range in the first band. We analyzed and discussed the focusing behaviors inside the acoustic lenses where the focalization at sub-wavelength scale was achieved. The focalization behind the gradient index phononic crystal is shown to be efficient as well: we report on FMHM = 0.63λ at 11MHz.
url http://dx.doi.org/10.1063/1.4905436
work_keys_str_mv AT jzhao beampathsofflexurallambwavesathighfrequencyinthefirstbandwithinphononiccrystalbasedacousticlenses
AT bbonello beampathsofflexurallambwavesathighfrequencyinthefirstbandwithinphononiccrystalbasedacousticlenses
AT oboyko beampathsofflexurallambwavesathighfrequencyinthefirstbandwithinphononiccrystalbasedacousticlenses
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