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Abstract
A review of the development of acoustic metamaterials, guided by their physical characteristics
and novel functionalities.
We have fabricated sonic crystals, based on the idea of localized resonant structures, that exhibit spectral gaps with a lattice constant two orders of magnitude smaller than the relevant wavelength. Disordered composites made from such localized resonant structures behave as a material with effective negative elastic constants and a total wave reflector within certain tunable sonic frequency ranges. A 2-centimeter slab of this composite material is shown to break the conventional mass-density law of sound transmission by one or more orders of magnitude at 400 hertz.
Publisher:
American Association for the Advancement of Science (AAAS)
ISSN
(Electronic):
2375-2548
Publication date Created:
February
05 2016
Publication date
(Print):
February
05 2016
Volume: 2
Issue: 2
Affiliations
[1
]Department of Physics and Institute for Advanced Study, Hong Kong University of Science
and Technology, Clear Water Bay, Kowloon, Hong Kong, China.