Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom

Insang Yoo, Chung Kyu Han, Dong Soo Shin, K. J.B. Lee, J. W. Wu, Han Seb Moon, Oliver B. Wright, Sam H. Lee

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


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 ∼50ms ahead or behind their arrivals. Applications include thin acoustic metasurface lenses.

Original languageEnglish
Article number4634
JournalScientific Reports
StatePublished - 14 Apr 2014


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