Manipulation of acoustic wave reflection for arbitrary reflecting surfaces based on acoustic metasurfaces

In this work, a general method to manipulate the angle of reflection from an arbitrary two-dimensional (2D) surface is proposed by applying an appropriate phase discontinuity along the arbitrary surface. Three surfaces, including plane surface, parabolic surface and circular surface are taken as instances to validate this method. The results show that angle of reflection is conducted to 60 degrees for a wave incident to a plane surface at 45 degrees, while 30 degrees for a wave incident to the parabolic and circular surfaces normally. This kind of manipulation of acoustic waves for arbitrary reflecting surfaces opens up an avenue for reflected wavefront modulations and associated applications such as anti-sonar technology.