<p>Understanding the plasmonic behavior of materials with large-scale inhomogeneity (like negative index metamaterial) is crucial because these materials cannot be modeled as simple scatterers. This is due to the emergence of plasmonic materials other than those based on noble metals and the advancement of sophisticated materials processing techniques. Propagation of surface plasmons can be achieved using a metamaterial and dielectric interface. Control of the surface plasmons opens the wide avenues for a broad range of applications. Similarly, the shape of individual surface nanostructures or the phase control of individual elements in an array of such structures can be used to regulate the propagation of surface plasmons at the interface between metal films and dielectric materials. Here, we show how to regulate surface plasmon propagation at the negative index metamaterial-dielectric interface. The negative index metamaterial enables the surface modes, while the adjacent dielectric is what tunes their properties.</p>