Showing papers by "Akira Kinbara published in 1971"
TL;DR: In this paper, a modification of Schopper's model is proposed, based on the assumption that an aggregated film consists of particles in the shape of rotational ellipsoids.
Abstract: For interpreting the optical properties of aggregated metal films, a modification of Schopper’s model is proposed, based on the assumption that an aggregated film consists of particles in the shape of rotational ellipsoids. Instead of the distribution of the depolarizing factor f in gaussian fashion, which is assumed in Schopper’s model, the logarithmic normal distribution of the axial ratio γ of the ellipsoidal particles was assumed and the parameter σ (standard deviation of the distribution function) was introduced. Besides, the contributions of the dipole interaction between particles and the size-dependent optical constants of the particles were taken into account. Using this modified model, the observed values of silver films continuously measured by ellipsometry during deposition were analyzed and the two parameters, the mean axial ratio γ¯ and the standard deviation σ, were obtained as functions of film thickness. The results showed that as film grows, both γ¯ and σ increase monotonically. Good coincidence of the observed and the calculated absorption spectra from our model seems to show the validity of our modification.
85 citations
TL;DR: In this article, the changes of the optical properties of aggregated silver films were investigated with an automatic recording ellipsometer immediately after deposition in vacuum and after admission of air into the vacuum chamber.
Abstract: The changes of the optical properties of aggregated silver films were investigated with an automatic recording ellipsometer immediately after deposition in vacuum and after admission of air into the vacuum chamber. The optical properties change for several minutes after the vapor stream is cut off from the substrate. By analyzing the changes with the model based on the two-dimensional distribution of island particles in the shape of ellipsoids of rotation (modified RE model), we found that these changes correspond to the decrease of the mean axial ratio of the island particles composing the film and the standard deviation of the distribution function of the axial ratio. That is, the flat island becomes globular after deposition. Such a morphological change of the particle is interpreted in terms of mass transport accompanied by surface self-diffusion. The changes followed by exposure to air can be interpreted by the formation of a layer of dielectric pellicle, such as an adsorption layer or a sulfide layer surrounding the island particles.
39 citations
7 citations
TL;DR: In this article, the authors measured the thermal expansion of vacuum deposited gold films being free from substrate by using a slide cathetometer from room temperature to 300°C and found that in lower temperature region (below 250°C) there was no appreciable difference between the expansion of gold films and that of bulk gold.
Abstract: Thermal expansion of vacuum deposited gold films being free from substrate was measured in a specially designed furnace by using a slide cathetometer from room temperature to 300°C. It was found that in lower temperature region (below 250°C) there was no appreciable difference between the thermal expansion of gold films and that of bulk gold. However, in higher temperature region (above 250°C), especially in case of relatively thinner films, the aspect of the thermal expansion drastically differed from that of bulk, that is, the contraction of film length was observed. The origin of the contraction was discussed from the viewpoint of the change of film structure due to heating.
1 citations