Abstract
The research on planar photonic crystal waveguides (PCW’s) is presently to a large extent focusing on PCW designs where the effective refractive index of the waveguiding region is high compared to that of the surrounding photonic crystal. From calculated dispersion relations it has been found that the guided electromagnetic modes in this type of waveguide are often characterized by a very low group velocity, and guidance is achieved only for rather limited frequency intervals (see e.g. [1]). The purpose of this paper is to provide design principles that will make possible the realization of planar PCW’s that support leakage-tree bandgap guidance of light over large frequency intervals.
© 2002 Optical Society of America
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