We have developed a model of the nonlinear polaritondynamics in realistic strongly-coupled 3D non-planarmicrocavity wires based on driven-disspative mean-field Gross-Pitaevskii equations. We find that the typical microcavity nonlinearoptical bistability response evolves into multistabilityupon variation of realistic model parameters and discuss itsorigin in terms of multiple co-existing transverse cavity modes.Conditions for formation of self-assembled lossless multimodepulses: polariton solitons, and geometry limitations for theirstable propagation are identified.
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