Cloaking dielectric spherical objects by a shell of metallic   nanoparticles
  We show that dielectric spheres can be cloaked by a shell of amorphously arranged metallic nanoparticles. The shell represents an artificial medium with tunable effective properties that can be adjusted such that the scattered signals of shell and sphere almost cancel each other. We provide an analytical model for the cloak design and prove numerically that the cloak operates as desired. We show that more than 70% of the scattered signal of the sphere can be suppressed at the design wavelength. Advantages and disadvantages of such a cloak when compared to other implementations are disclosed. 
Stefan Muhlig, Mohamed Farhat, Carsten Rockstuhl, Falk Lederer
cond-mat.other physics.optics