We consider evolution of multichannel excitations in longitudinally modulatedwaveguide arrays where refractive index either oscillates out-of-phase in allneighboring waveguides or when it is modulated in phase in several centralwaveguides surrounded by out-of-phase oscillating neighbors. Both types ofmodulations allow resonant inhibition of light tunneling, but only themodulation of latter type conserves the internal structure of multichannelexcitations. We show that parameter regions where light tunneling inhibition ispossible depend on the symmetry and structure of multichannel excitations.Antisymmetric multichannel excitations are more robust than their symmetriccounterparts and experience nonlinearity-induced delocalization at higheramplitudes.
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