Page 01/03/2016 10:58:50

Paper accepted by Appl. Phys. Lett.

1/3/2016
The paper entitled "High Transmission Acoustic Focusing by Impedance-matched Acoustic Meta-surfaces" has been accepted for publication in APL.  In this paper, we proposed designs for impedance-matched acoustic metasurfaces to focus acoustic waves in water and air.  The acoustic lens in water is designed from space-coiling structure, which is know to have huge impedance-mismatch issues.  We improved the structure by using a different filling material to make the effective impedance matched to the background.  Such structure does not rely on resonance. Therefore, it is broadband. The acoustic lens in air is designed from layered-structures, in which the input impedance is matched to the air. Both types of lenses can support high energy transmission.