Publication Date:
2014-04-15
Description:
The realization of phase discontinuities across metasurfaces has led to a new class of reflection and refraction. Here we present theory and experiment on the discontinuous propagation of wavepackets across subwavelength-thickness meta-atoms. Using acoustic waves, we observe the process of wavepackets traversing a meta-atom with abrupt displacements, which appear as path discontinuities on a space-time diagram. We construct a tunable meta-atom from two coupled resonators at ~500Hz, map the spatiotemporal trajectories of individual sonic pulses, and reveal discontinuities at the meta-atom where the pulses exit at a time ~50ms ahead or behind their arrivals. Applications include thin acoustic metasurface lenses. Scientific Reports 4 doi: 10.1038/srep04634
Electronic ISSN:
2045-2322
Topics:
Natural Sciences in General
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