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We present the analysis and design of three-dimensional (3D) photonic crystal (PC) demultiplexers in which the simultaneous existence of the superprism effect and the diffraction compensation results in a compact structure. We have used tetragonal woodpile PCs fabricated by 3D patterning of a polymer material through a direct laser writing technique for experimental demonstration of these devices.
We show that the propagation of optical beams inside three-dimensional photonic crystals can be efficiently described by an approximate scalar diffraction model. The main advantage of this model is that it reduces the memory and computation time for direct simulations of three-dimensional photonic crystals by converting the problem into an equivalent problem for which simple geometrical optics can...
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