FIG 2.

Theoretical absorption efficiency of the nanocubes. (a) Effective absorption efficiency as a function of the spacer thickness, defined as the ratio of the absorption cross-section for a single nanocube to its physical cross-section. The absorption cross-section is computed as the ratio of the energy absorbed over the illumination intensity. (b) Reflectance spectrum for cubes that are 70 nm large, periodically (350 nm) distributed, spaced from the metallic film by a 8 nm thick dielectric layer (c) Modulus of the magnetic field for the mode that is guided under the cube (out of plane wavevector).