On the local homogenization of metallic sculptured thin films

The concept of local homogenization is employed for estimation of the relative permittivity scalars in copper Sculp-tured Thin Film (STFs). Three absorption transitions of dielectric to metal occur in the copper STFs. These transi-tions reduce to two in columns with circular cross section, when the volumetric fraction of metallic particles in-creases from zero to unity. The first transition occurs at low volumetric fraction of metallic inclusions and the other two transitions appear at high volumetric fraction of metallic inclusions. The influence of the column shape factors on the absorption transitions of dielectric to metal is also reported.