Figure 1
From: Strong optical absorption of a metallic film to induce a lensing effect in the visible region
(a) Ellipsometrically measured spectra of the real and imaginary parts of the complex dielectric function ε (ε = ε1 + iε2) of a thick planar Au film sample in the 276–827 nm wavelength range. (b) The spectra of the real and imaginary parts, n and k, of the complex refractive index reduced from the intrinsic relationship to the dielectric function ε. The onset (Eg) of the interband transitions occurs at a photon energy of approximately 2.5 eV, corresponding to a wavelength of approximately 497 nm.
