One-way phonon isolation in acoustic waveguides

We present a method to achieve one-way phonon isolation in acoustic waveguides by considering spatio-temporal modulation of material properties. One-way conversion between symmetric and antisymmetric shear horizontal modes of an unbounded plate acoustic waveguide is numerically demonstrated using this method. Analytical and numerical evidence for the possibility of mode conversion is presented. Possible experimental implementation and applications for on-chip signal isolation in MEMS devices are also suggested.