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 $\overline{\gamma }$ and the standard deviation σ, were obtained as functions of film thickness. The results showed that as film grows, both $\overline{\gamma }$ 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.

© 1971 Optical Society of America

Changes of the Optical Properties of Aggregated Silver Films after Deposition

Sadafumi Yoshida, Tomuo Yamaguchi, and Akira Kinbara
J. Opt. Soc. Am. 61(4) 463-469 (1971)

Determination of the Inter-Island Dielectric Constant in Aggregated Silver Films, by Measurement of Optical Plasma Resonance Absorption

Sadafumi Yoshida, Tomuo Yamaguchi, and Akira Kinbara
J. Opt. Soc. Am. 62(12) 1415-1419 (1972)

Optical properties of aggregated noble metal films*

V. V. Truong and G. D. Scott
J. Opt. Soc. Am. 67(4) 502-510 (1977)

Effect of retarded dipole–dipole interactions between island particles on the optical plasma-resonance absorption of a silver-island film

Tomuo Yamaguchi, Sadafumi Yoshida, and Akira Kinbara
J. Opt. Soc. Am. 64(11) 1563-1568 (1974)

Optical constants of aggregated gold films

V. V. Truong and G. D. Scott
J. Opt. Soc. Am. 66(2) 124-131 (1976)