The idea of the angular, or equivalently – spatial filtering, is based on a selective diffraction of the angular components of the light propagating through a double-periodic photonic structure: the angular components of the incident light at a resonance with the transverse qr and longitudinal ql structure lattice vectors diffract efficiently and are removed from the zero-diffraction order T0 of the transmitted beam. In case of two-dimensional, axisymmetric, filtering an additional effect was reported as well: the filtered out angular components re-diffract back from the first T−1,+1 order- to the zeroth-order T0 diffraction component, specifically, to the near-zero propagation angles. This results in enhancement of the low angle beam components, which comprises a beam collimation effect [1].

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