Asymmetric phase modulation of acoustic waves through unidirectional metasurfaces

Asymmetric phase modulation of acoustic waves through unidirectional metasurfaces An acoustic asymmetric phase modulation metasurface (APMM) has been proposed theoretically and demonstrated numerically. We find that the proposed APMM could realize the asymmetric transmission of the acoustic wave and the conversion of the propagating wave into the surface wave. The underlying mechanism is based on an asymmetric phase modulation by coupling an acoustic gradient index metasurface (AGIM) and a near-zero-index medium (ZIM). The AGIM and ZIM are implemented by only employing the coiling-up-space structures. Numerical simulations also show that the APMM could provide the high transmission contrast for the asymmetric transmission. The subwavelength thickness and flat geometry of the APMM may be useful for the further actual applications in the acoustic artificial device. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Applied Physics A: Materials Science Processing Springer Journals

Asymmetric phase modulation of acoustic waves through unidirectional metasurfaces

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2017 by Springer-Verlag GmbH Germany
Subject
Physics; Condensed Matter Physics; Optical and Electronic Materials; Nanotechnology; Characterization and Evaluation of Materials; Surfaces and Interfaces, Thin Films; Operating Procedures, Materials Treatment
ISSN
0947-8396
eISSN
1432-0630
D.O.I.
10.1007/s00339-017-1289-3
Publisher site
See Article on Publisher Site

Abstract

An acoustic asymmetric phase modulation metasurface (APMM) has been proposed theoretically and demonstrated numerically. We find that the proposed APMM could realize the asymmetric transmission of the acoustic wave and the conversion of the propagating wave into the surface wave. The underlying mechanism is based on an asymmetric phase modulation by coupling an acoustic gradient index metasurface (AGIM) and a near-zero-index medium (ZIM). The AGIM and ZIM are implemented by only employing the coiling-up-space structures. Numerical simulations also show that the APMM could provide the high transmission contrast for the asymmetric transmission. The subwavelength thickness and flat geometry of the APMM may be useful for the further actual applications in the acoustic artificial device.

Journal

Applied Physics A: Materials Science ProcessingSpringer Journals

Published: Dec 1, 2017

References

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