Particulate films, consisting of a 3-D arrangement of ultrafine Au or Ag particles with diameters of 8–20 nm, were prepared using the gas evaporation technique. As a consequence of the low packing density of the particles, films with a thickness of ~4 μm show very low reflectivities of <3% in the wavelength range of 300–1000 nm, causing high absorption of incident light. Additionally the sintering temperature of the ultrafine particles is very low (~350°C for Au). So a drastic altering of the optical properties of the particulate films is observed when irradiated by a laser. A sensitive optical recording medium with an adjustable reflectivity can be realized using a two-layer configuration with a reflector layer covered by a thin ~0.5-μm particulate Au film. Particulate Au or Ag films can also be used for photographic applications.
© 1989 Optical Society of AmericaFull Article | PDF Article
Keith L. Lewis, I. T. Muirhead, A. M. Pitt, A. G. Cullis, N. G. Chew, A. Miller, and T. J. Wyatt-Davies
Appl. Opt. 28(14) 2785-2791 (1989)
Haluk O. Sankur and William Gunning
Appl. Opt. 28(14) 2806-2808 (1989)
Sarah-Katharina Meisenheimer, Sabrina Jüchter, Oliver Höhn, Hubert Hauser, Christine Wellens, Volker Kübler, Elizabeth von Hauff, and Benedikt Bläsi
Opt. Mater. Express 4(5) 944-952 (2014)