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.

Report Date:

1996-09-01

Pagination or Media Count:

21.0

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