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Title: Meta-atom cluster acoustic metamaterial with broadband negative effective mass density

We design a resonant meta-atom cluster, via which a two-dimensional (2D) acoustic metamaterial (AM) with broadband negative effective mass density from 1560 Hz to 5580 Hz is fabricated. Experimental results confirm that there is only weak interaction among the meta-atoms in the cluster. And then the meta-atoms in the cluster independently resonate, resulting in the cluster becoming equivalent to a broadband resonance unit. Extracted effective refractive indices from reflection and transmission measurements of the 2D AM appear to be negative from 1500 Hz to 5480 Hz. The broadband negative refraction has also been demonstrated by our further experiments. We expect that this meta-atom cluster AM will significantly contribute to the design of broadband negative effective mass density AM.
Authors:
; ; ; ; ;  [1]
  1. Smart Materials Laboratory, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710129 (China)
Publication Date:
OSTI Identifier:
22278127
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ACOUSTICS; ATOMIC CLUSTERS; ATOMS; DENSITY; EFFECTIVE MASS; FREQUENCY DEPENDENCE; NANOSTRUCTURES; REFLECTION; REFRACTION; REFRACTIVE INDEX; SOLID CLUSTERS; TRANSMISSION