Voltage-controlled membrane-type active acoustic metasurfaces with ultrathin thickness

摘要

We propose an ultrathin membrane-type active acoustic metasurfaces with deep-subwavelength thickness for arbitrarily steering the transmitted acoustic wavefront in real-time via adjustment of the static voltage distribution. The underlying mechanism is that the change of tension on the middle membrane by the stresses introduced by the voltage exerted on the piezoelectric layers modulates the surface phase profile. The performance of the resulting device is numerically demonstrated via versatile wave-steering phenomena. Our design with functionality and flexibility opens up possibility for the design of active acoustic functional devices and may find important application in diverse fields such as acoustic communication. (C) 2019 The Japan Society of Applied Physics