Figure 7.
Effect of grating period. Calculated transmittance spectra for ϕ = 90° and for θ = 1° as a function of grating period. The PMMA thickness was 1.5 μm, and the gap between the metal stripes was kept constant at 1.0 μm. The green dashed lines are the second- and third-order grating scattered silicon light-lines. The somewhat diagonal features (transmittance minima) in the data are associated with these light-lines. The vertical feature at kg/2π ≈ 2 m–1 is an artifact of the numerical calculation. Here β = 0°.