Abstract

The optical absorption of Ag- island films formed at room temperature has been investigated in a normal transmittance spectrum and its derivative in the wavelength range between 300 and 800 nm. For the films with particle diameter larger than about 70 Å, a secondary absorption was found besides the plasma resonance absorption. Taking into account the influences of interparticle dielectric constant, annealing, particle size, and sulfurization, the secondary absorption is attributed to the plasma resonance absorption due to low-electron-density particles. An expression is derived for the plasma resonance absorption of island films composed of low- and bulk-electron-density particles. The transmittance spectrum and its derivative computed from this expression agreed with the experimental results.

© 1986 Optical Society of America

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)

Nature of the enhanced optical absorption of dye-coated Ag island films

C. F. Eagen
Appl. Opt. 20(17) 3035-3042 (1981)

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)

Resonance wavelengths of silver–gold compound metal island films

Kazutaka Baba, Toshiaki Okuno, and Mitsunobu Miyagi
J. Opt. Soc. Am. B 12(12) 2372-2376 (1995)

Optical properties of silver island films in the attenuated-total-reflection geometry

T. Inagaki, J. P. Goudonnet, P. Royer, and E. T. Arakawa
Appl. Opt. 25(20) 3635-3639 (1986)