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.
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