| Autor: |
Horwitz, C. M., McPhedran, R. C., Beunen, J. A. |
| Zdroj: |
Journal of the Optical Society of America (1917-1983); August 1978, Vol. 68 Issue: 8 p1023-1031, 9p |
| Abstrakt: |
The optical properties of globular Sn films on Al_2O_3 substrates are analyzed. These films are composed of Sn particles with sizes of the order of the wavelength of visible light, and are of interest because of their solar-selective properties. The experimental data show interference-film properties at long wavelengths, and a large diffracted component at short wavelengths superimposed on a Lambertian angular distribution. The calculated properties of finite-conductivity wire gratings in general agree well with the observed film properties; however, at short wavelengths a scalar diffraction model describes the angular distribution of the transmitted diffracted light. In this model the globular film appears to have film-thickness variations, and a coherence length of approximately two globule diameters. With an empirical “shadowing” term removed from the experimental data, this scalar model works well even at relatively long wavelengths (λ/4 ≤ globule radius). |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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