APPLICATION OF SILVER-DISPERSED ALN THIN-FILM TO SOLAR CONTROL GLASS

Solar reflective multilayered films which mainly reflect near-infrared rays in solar radiation but transmit radio waves were prepared by dis persing fine silver particles in an AlN layer of the film. The silver particle-dispersed AlN film was fabricated by heating the film consist ing of three layers of AlN, Ag, and AlN. A theoretical equation regard ing the reflection-wavelength relationship was derived based on the as sumption that the power reflection coefficient of dielectric film, in which metal particles are randomly dispersed, is expressed by the refl ection from many domains of different sizes, each domain consisting of periodic conductive square segments. Comparing the theoretical values of reflection for silver-dispersed AlN thin film with the observed on es allows us to estimate the mean size and thickness of silver particl e to be 130 and 18 nm, respectively. This suggests that the frequency selective screen which reflects only near-infrared rays can be designe d by controlling the size of silver particles. (C) 1998 American Insti tute of Physics. [S0021-8979(98)06223-9].