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Title: Acoustic superfocusing by solid phononic crystals

We propose a solid phononic crystal lens capable of acoustic superfocusing beyond the diffraction limit. The unit cell of the crystal is formed by four rigid cylinders in a hosting material with a cavity arranged in the center. Theoretical studies reveal that the solid lens produces both negative refraction to focus propagating waves and surface states to amplify evanescent waves. Numerical analyses of the superfocusing effect of the considered solid phononic lens are presented with a separated source excitation to the lens. In this case, acoustic superfocusing beyond the diffraction limit is evidenced. Compared to the fluid phononic lenses, the solid lens is more suitable for ultrasonic imaging applications.
Authors:
 [1] ;  [2] ;  [3] ; ;  [1] ;  [2]
  1. CNRS, Institut Jean Lamour, Vandoeuvre-lès-Nancy F-54506 (France)
  2. (France)
  3. (China)
Publication Date:
OSTI Identifier:
22395507
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACOUSTICS; COMPARATIVE EVALUATIONS; CRYSTALS; DIFFRACTION; EXCITATION; FLUIDS; LENSES; NUMERICAL ANALYSIS; PHONONS; REFRACTION; SOLIDS; SURFACES