Effect of refractive index gradients on index measurement by the abeles method.
Abeles's method of determining the refractive index of a thin film is discussed. Attention is directed to the effect of a graded index transition between the film and the substrate on the measured index. First, a closed-form analysis of the problem for a long transition region is given. This is followed by a computer analysis applicable to transition regions of any length.
Goell
J E
JE
Standley
R D
RD