  Formation of a novel hybrid-vector spatial plasmon-soliton in a Kerr slab
embedded in-between metal plates is predicted and analyzed with a modified
NLSE, encompassing hybrid vector field characteristics. Assisted by the
transverse plasmonic effect, the self trapping dimension of the plasmon-soliton
was substantially compressed (compared to the dielectrically cladded slab case)
when reducing the slab width. The practical limitation of the Plasmon-soliton
size reduction is determined by available nonlinear materials and metal loss.
For the extreme reported values of nonlinear index change, we predict soliton
with a cross section of 300nm x 30nm (average dimension of 100nm).
