FIG. 5. Diffuse transmittance for a rectangular grating with infinite Si substrate with L=1000 nm. The contour plot shows the results calculated with RCWA. The lines show the maxima predicted with modal analysis, due to interference between the zeroth and fourth grating modes for =830–1000 nm solid lines and interference between the zeroth and sixth grating modes for =650–750 nm dashed lines .
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