Figure 17.

A plane wave is incident at ψ=0.1361 on a lattice of 2000 gratings with d_x=1.0, $d_y=\sqrt{2}$ for β=5.6, κ_y=0.76. (a) Moduli of the coefficients |A_k| with the first 50 shown for both Foldy (solid curve) and Wiener–Hopf (dots). (b) Real part of the total displacement field. (c) Magnification of the third dispersion surface. (d) Real part of the total displacement field for β=5.6, ψ=0.2712, κ_y=1.5. (Online version in colour.)