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We propose an efficient method for spatial filtering of light beams bypropagating them through 2D (also 3D) longitudinally chirped photonic crystals,i.e. through the photonic structures with fixed transverse lattice period andwith the longitudinal lattice period varying along the direction of the beampropagation. We prove the proposed idea by numerically solving the paraxialpropagation equation in refraction index-modulated media, and we evaluate theefficiency of the process by plane-wave-expansion analysis. The technique canbe applied to filter (to clean) the packages of atomic waves (Bosecondensates), as well improve the directionality of acoustic and mechanicalwaves.

Spatial filtering of light by chirped photonic crystals