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Title: 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 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.
Authors:
;  [1] ;  [2]
  1. UPMC Univ Paris 06, UMR 7588, Institut des NanoSciences de Paris, F-75005, Paris (France)
  2. CNRS, UMR 7588, Institut des NanoSciences de Paris, F-75005, Paris (France)
Publication Date:
OSTI Identifier:
22420180
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 4; Journal Issue: 12; Other Information: (c) 2014 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BEAMS; CRYSTALS; LENSES; NUMERICAL ANALYSIS; SHEEP; WAVELENGTHS