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Phys Rev Lett. 2017 Jul 21;119(3):035501. doi: 10.1103/PhysRevLett.119.035501. Epub 2017 Jul 18.

Tunable Asymmetric Transmission via Lossy Acoustic Metasurfaces.

Author information

1
Institute of Acoustics, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China.
2
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, People's Republic of China.
3
Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.
4
Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, North Carolina 27695, USA.

Abstract

In this study, we show that robust and tunable acoustic asymmetric transmission can be achieved through gradient-index metasurfaces by harnessing judiciously tailored losses. We theoretically prove that the asymmetric wave behavior stems from loss-induced suppression of high order diffraction. We further experimentally demonstrate this novel phenomenon. Our findings could provide new routes to broaden applications for lossy acoustic metamaterials and metasurfaces.

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