Observation of acoustic Dirac-like cone and double zero refractive index

Marc Dubois, Chengzhi Shi, Xuefeng Zhu, Yuan Wang and Xiang Zhang ()
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Marc Dubois: NSF Nano-scale Science and Engineering Centre (NSEC), University of California
Chengzhi Shi: NSF Nano-scale Science and Engineering Centre (NSEC), University of California
Xuefeng Zhu: NSF Nano-scale Science and Engineering Centre (NSEC), University of California
Yuan Wang: NSF Nano-scale Science and Engineering Centre (NSEC), University of California
Xiang Zhang: NSF Nano-scale Science and Engineering Centre (NSEC), University of California

Nature Communications, 2017, vol. 8, issue 1, 1-6

Abstract: Abstract Zero index materials where sound propagates without phase variation, holds a great potential for wavefront and dispersion engineering. Recently explored electromagnetic double zero index metamaterials consist of periodic scatterers whose refractive index is significantly larger than that of the surrounding medium. This requirement is fundamentally challenging for airborne acoustics because the sound speed (inversely proportional to the refractive index) in air is among the slowest. Here, we report the first experimental realization of an impedance matched acoustic double zero refractive index metamaterial induced by a Dirac-like cone at the Brillouin zone centre. This is achieved in a two-dimensional waveguide with periodically varying air channel that modulates the effective phase velocity of a high-order waveguide mode. Using such a zero-index medium, we demonstrated acoustic wave collimation emitted from a point source. For the first time, we experimentally confirm the existence of the Dirac-like cone at the Brillouin zone centre.

Date: 2017
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DOI: 10.1038/ncomms14871

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