A plasmonic display device is provided having dual modulation mechanisms. The device has an electrically conductive bottom electrode that may be either transparent or reflective. A dielectric layer overlies the bottom electrode, made from an elastic polymer material having a refractive index responsive to an electric field. An electrically conductive top electrode, either transparent or reflective, overlies the dielectric layer. A plasmonic layer, including a plurality of discrete plasmonic particles, is interposed between the top and bottom electrodes and in contact with the dielectric layer. In one aspect, the plasmonic layer is embedded in the dielectric layer. Alternately, the plasmonic layer overlies the bottom (or top) electrode. Then, the dielectric layer overlies the plasmonic layer particles and exposed regions of the bottom electrode between the first plasmonic layer particles.