title: Locally resonant sonic materials
abstract: 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.
authors.affiliation: Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
authors.initials: Z
authors.lastname: Liu
authors.initials: X
authors.lastname: Zhang
authors.initials: Y
authors.lastname: Mao
authors.initials: YY
authors.lastname: Zhu
authors.initials: Z
authors.lastname: Yang
authors.initials: CT
authors.lastname: Chan
authors.initials: P
authors.lastname: Sheng