Imaging properties of multimode photonic crystal waveguides and waveguide arrays

Light propagation in multimode photonic crystal
(PC) waveguides and in arrays of single-mode PC waveguides is
analyzed. The dispersion relations of the modes traveling along
these devices explain the numerically observed formation of single
and multiple copies of the input beam. As the analogous devices
constructed in a standard planar geometry, the proposed PC
devices can be employed as filters and demultiplexers. The use of
PC structures, where the light is truly confined by the stopband,
adds the valuable benefit of a dramatic reduction of the overall
geometrical dimensions.