FIG. 2: When a shear wave beam of (dimensionless) frequency 0 . 6 is incident upon the PC, it gets refracted with angle π/ 6 (if the incidence angle is smaller then π/ 3) or totally reflected (if the incidence angle is close to or larger then π/ 3). The field patterns for incidence angles equal to 10 $^{◦}$, 40 ◦ and 60 ◦ are shown in (a), (b) and (c), respectively. 11