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- Title
Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom.
- Authors
Insang Yoo; Chung Kyu Han; Dong-Soo Shin; Lee, K. J. B.; Wu, J.W.; Han Seb Moon; Wright, Oliver B.; Lee, Sam H.
- Abstract
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 ,500 Hz, map the spatiotemporal trajectories of individual sonic pulses, and reveal discontinuities at the meta-atom where the pulses exit at a time ,50 ms ahead or behind their arrivals. Applications include thin acoustic metasurface lenses.
- Subjects
SPATIOTEMPORAL processes; WAVE packets; WAVE mechanics; SOUND waves; RESONATORS
- Publication
Scientific Reports, 2014, p1
- ISSN
2045-2322
- Publication type
Article
- DOI
10.1038/srep04634