Journal
APPLIED PHYSICS LETTERS
Volume 108, Issue 22, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4953264
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Funding
- Multidisciplinary University Research Initiative grant from the Office of Naval Research [N00014-13-1-0631]
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We present a design of acoustic metasurfaces yielding asymmetric transmission within a certain frequency band. The design consists of a layer of gradient-index metasurface and a layer of low refractive index metasurface. Incident waves are controlled in a wave vector dependent manner to create strong asymmetric transmission. Numerical simulations show that the approach provides high transmission contrast between the two incident directions within the designed frequency band. This is further verified by experiments. Compared to previous designs, the proposed approach yields a compact and planar device. Our design may find applications in various scenarios such as noise control and therapeutic ultrasound. Published by AIP Publishing.
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