Effect of Substrate on Radiative Properties of Thin Films
An expression for the directional transmittance of an absorbing thin film on an absorbing substrate was developed by using the classical electromagnetic theory. This expression when combined with the well-studied reflectance can yield absorptance values that are of utmost interest in heat transfer studies. The behavior of the normal and hemispherical reflectance, absorptance, and transmittance is exhibited for some selected values of film and substrate optical constants and is presented graphically as a function of film optical thickness. The results indicate that the imaginary part of the complex index of refraction for both films and substrate should be accounted for when calculating radiative tranfer and properties of such films.
B. F. Armaly and D. C. Look, "Effect of Substrate on Radiative Properties of Thin Films," Applied Optics, Optical Society of American, Jan 1973.
The definitive version is available at http://dx.doi.org/10.1364/AO.12.001904
Mechanical and Aerospace Engineering
Article - Journal
© 1973 Optical Society of American, All rights reserved.