Abstract
A two-dimensional photonic crystal based on a lattice of silicon rods in air with a photonic bandgap in the visible and near-ultraviolet spectra is proposed by removing some of the silicon rods or resizing their radii to create a monotonically varying tapered line defect, thereby pertaining to a case of structure-based nonlinearity and making it possible to operate with low input powers. By properly manipulating the length of the line defect, pulse compression and consequent adiabatic amplification are seen, along with bunching/antibunching of pulses. For certain modes of operation, field confinement is observed, and this leads to the formation of discrete pulses, or light bullets. Such a structure can be used as a multifunctional device, with some of the functionalities being optical nonpumped amplification, frequency upconversion, memory writing, matched termination, and slow wave guiding, which form the major conclusions of the work.
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