Abstract

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 America

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