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

doi:10.1038/srep04634

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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

Original language	English
Article number	4634
Journal	Scientific Reports
Volume	4
DOIs	https://doi.org/10.1038/srep04634
State	Published - 14 Apr 2014

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (NRF-2013K2A2A4003469 and NRF-2013R1A5A1A95042044). We also acknowledge Grants-in-aid for Scientific Research from the Japan Society for the Promotion of Education, Science, Sports and Culture.

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title = "Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom",

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

author = "Insang Yoo and Han, {Chung Kyu} and Shin, {Dong Soo} and Lee, {K. J.B.} and Wu, {J. W.} and Moon, {Han Seb} and Wright, {Oliver B.} and Lee, {Sam H.}",

note = "Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (NRF-2013K2A2A4003469 and NRF-2013R1A5A1A95042044). We also acknowledge Grants-in-aid for Scientific Research from the Japan Society for the Promotion of Education, Science, Sports and Culture.",

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doi = "10.1038/srep04634",

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AU - Yoo, Insang

AU - Han, Chung Kyu

AU - Shin, Dong Soo

AU - Lee, K. J.B.

AU - Wu, J. W.

AU - Moon, Han Seb

AU - Wright, Oliver B.

AU - Lee, Sam H.

N1 - Funding Information: This research was supported by Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (NRF-2013K2A2A4003469 and NRF-2013R1A5A1A95042044). We also acknowledge Grants-in-aid for Scientific Research from the Japan Society for the Promotion of Education, Science, Sports and Culture.

PY - 2014/4/14

Y1 - 2014/4/14

N2 - 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.

AB - 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.

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Spatiotemporal path discontinuities of wavepackets propagating across a meta-atom

Abstract

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