Lateral shift of acoustic wave at interface between double-positive and double-negative media

When medium has a negative effective bulk modulus and density, it is called double-negative medium. On the basis of the case, we theoretically derive lateral shift of total reflection wave at interface when an acoustic wave from one medium into the other, analyze systematically the directions of lateral shift when acoustic wave from double-positive (double-negative) medium into double-negative and double-positive medium, and point out the directions of energy flux and wave vector in double-positive medium and double-negative medium