Figure 6
From: Broadband All-angle Negative Refraction by Optimized Phononic Crystals

Normalized intensity distributions along the direction perpendicular (a) and parallel (b) to the phononic slab surface at different frequencies.
From: Broadband All-angle Negative Refraction by Optimized Phononic Crystals
Normalized intensity distributions along the direction perpendicular (a) and parallel (b) to the phononic slab surface at different frequencies.