Abstract
A low-intensity light cannot propagate through a photonic bandgap (PBG) crystal if its frequency falls into a band gap. However, it has been recently suggested, in the framework of the couplemode theory,1 that in the case of a two-dimensional (2D) periodic medium with a Kerr-type nonlinear material, high-intensity light with the frequency inside the gap can propagate in the form of finite energy solitary waves—2D gap solitons, which are localized in both directions.
© 2001 Optical Society of America
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