Accession Number : ADA318756

Title :   A Real-Space, Modal-Expansion Method with the R-Matrix Propagator To Calculate Grating Diffraction.

Descriptive Note : Interim rept. Oct 95-Sep 96,

Corporate Author : NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA

Personal Author(s) : Elson, J. M. ; Tran, P.

PDF Url : ADA318756

Report Date : SEP 1996

Pagination or Media Count : 21

Abstract : Recently the R-matrix propagation algorithm has been used in conjunction with a k-space modal-expansion to calculate diffraction from gratings. The R-matrix eliminates numerical instability associated with deep gratings. We introduce here a real-space version of the modal-expansion method. A detailed numerical study of the convergence versus number of diffracted orders is given. For wavelength lambda, we consider sinusoidal gratings having height h = 1.7-lambda and 17-lambda where both have period d = l.7-lambda. We consider absorbing metallic and nonabsorbing dielectric gratings. Results are compared with those of other authors and with our previous results.

Descriptors :   *GRATINGS(SPECTRA), *DIFFRACTION, MATRICES(MATHEMATICS), NUMERICAL ANALYSIS, CONVERGENCE.

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE