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Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 68, Iss. 8 — Aug. 1, 1978
  • pp: 1023–1031

Interference and diffraction in globular metal films

C. M. Horwitz, R. C. McPhedran, and J. A. Beunen  »View Author Affiliations


JOSA, Vol. 68, Issue 8, pp. 1023-1031 (1978)
http://dx.doi.org/10.1364/JOSA.68.001023


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Abstract

The optical properties of globular Sn films on Al<sub>2</sub>O<sub>3</sub> 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).

© 1978 Optical Society of America

Citation
C. M. Horwitz, R. C. McPhedran, and J. A. Beunen, "Interference and diffraction in globular metal films," J. Opt. Soc. Am. 68, 1023-1031 (1978)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-68-8-1023


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