  We predict multiband vector Plasmonic Lattice Solitons (PLSs) in
metal-dielectric waveguide arrays, in both focusing and defocusing
nonlinearities. Such vector solitons consist of two components originating from
different transmission bands. By simulating the full nonlinear Maxwell
equations (MEs), we demonstrate the diffractionless propagation of vector PLSs
and their discrete diffraction when only one component is present. Their
subwavelength size characteristics and the influences of metallic losses are
also studied.
