The flexural-wave-based lens design for energy focusing via the trajectory prediction and the phase modulation

A plane lens that has the ability of focusing the flexural wave emitting from a point source into a focal point has been successfully designed by two methods, i.e., the trajectory prediction and the phase modulation. For the trajectory prediction, the lens makes the flexural waves along different paths arriving at the focal point simultaneously. For the phase modulation, the lens is designed via letting the waves producing the same phase at the...