Leading term approximative analytical formulas are derived for the powers of the fringes formed by a periodically distorted homogeneous nematic layer, illuminated by a monochromatic light beam at normal incidence. The agreement between the predictions of the derived formulas and those of the direct numerical computation for the odd-order fringes is restricted to very small distortions and, thus, to very low fringe power values. On the other hand, the respective comparison for the even-order fringes gives quite satisfactory results provided the sample is sufficiently thick and the order of the fringe is low.
© 1989 Optical Society of America
Original Manuscript: July 22, 1987
Published: August 15, 1989
H. M. Zenginoglou and J. A. Kosmopoulos, "Geometrical optics approach to the nematic liquid crystal grating: leading term formulas," Appl. Opt. 28, 3516-3519 (1989)