A Real-Space, Modal-Expansion Method with the R-Matrix Propagator To Calculate Grating Diffraction.
Interim rept. Oct 95-Sep 96,
NAVAL AIR WARFARE CENTER WEAPONS DIV CHINA LAKE CA
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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.