The equivalence of generalized multiwave coupled-wave theory and rigorous modal theory for describing diffraction by volume periodic structures is established. The detailed connection between these theories is presented. The coupled-wave approach, which provides simple formulation and good physical insight, may thus also be used to obtain exact results.
© 1979 Optical Society of America
R. Magnusson and T. K. Gaylord, "Equivalence of multiwave coupled-wave theory and modal theory for periodic-media diffraction," J. Opt. Soc. Am. 68, 1777-1779 (1978)