Designing 2D Phononic Crystal Slabs with Transmission Gaps for Solid Angle as well as Frequency Variation

Figure 3

Contour plot of transmittance for a PC slab with lead cylinders in an epoxy host. Parameters of the slab are given in the text. The direction vector of the incident compressional wave is (sin 𝜃 cos 𝜑, sin 𝜃 sin φ, cos 𝜃). The black and gray contours are at −150 dB and −10 dB, respectively.