Figure 2


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(a) Diffraction orders of a rectangular lattice in spatial-frequency representation at normal incidence. Diffraction orders are represented by dots at positions kxm = mKx, ky = nKy. Blue and red circles represent the cut-off radial spatial frequencies kρ = k0nsub and kρ = k0nsup, respectively, between which BSW excitation is possible. The yellow circle indicates the radial spatial frequency of BSW for a given ML. (b) Definition of the propagation angles (θmnϕmn) of a single transmitted diffracted order (m, n) in its exit plane (the grey rectangle) and the π − σ basis of the diffracted electric field.

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