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Title: Radiation directivity rotation by acoustic metamaterials

We use a metamaterial-based scheme to rotate the radiation directivity of sound radiated by a source surrounded by the structure. The rotation is demonstrated through both numerical simulations and experiments. The performance persists within a broadband and is entirely independent of the location and pattern of source inside, suggesting great potential in various practical scenarios where both the signal frequency and source position may vary significantly. We have also investigated the possibility to realize versatile controls of radiation direction by tailoring the structural parameters. Our design with special directivity-steering capability may open route to loudspeaker and auditorium acoustics designs and medical ultrasound applications.
Authors:
; ; ;  [1] ;  [2] ;  [3]
  1. Key Laboratory of Modern Acoustics, MOE, Department of Physics, Institute of Acoustics, Nanjing University, Nanjing 210093 (China)
  2. (China)
  3. Department of Physics and Center for Nonlinear Dynamics, University of Texas at Austin, Austin, Texas 78712 (United States)
Publication Date:
OSTI Identifier:
22489211
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 9; Other Information: (c) 2015 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; COMPUTERIZED SIMULATION; CONTROL; DESIGN; METAMATERIALS; PERFORMANCE; ROTATION; SIGNALS; SOUND WAVES