A goniometric ellipsometer is used to recover the optogeometrical parameters of metallic gratings. The phase difference between TE and TM polarizations in all the diffracted orders is measured as a function of the incidence angle. The groove depth, together with the refractive indices of all the media of the diffracting structure, is determined for a holographic sinusoidal aluminum grating. It is shown that a thin layer of alumina on top of the grating must be considered.
© 1996 Optical Society of America
H. Giovannini, C. Deumié, H. Akhouayri, and C. Amra, "Angle-resolved polarimetric phase measurement for the characterization of gratings," Opt. Lett. 21, 1619-1621 (1996)