The coordinate transformation method (C method) with adaptive spatial resolution and the Fourier modal method (FMM) are compared in the case of conducting discontinuous multilevel gratings in TM polarization. A procedure permitting analysis of such gratings more efficiently with the C method than with the FMM is presented. The C method is observed to converge more rapidly than the FMM, whose instabilities are shown to harm the convergence in the aforementioned case.
© 2002 Optical Society of America
Original Manuscript: January 28, 2002
Revised Manuscript: March 22, 2002
Manuscript Accepted: March 26, 2002
Published: August 1, 2002
Tuomas Vallius, "Comparing the Fourier modal method with the C method: analysis of conducting multilevel gratings in TM polarization," J. Opt. Soc. Am. A 19, 1555-1562 (2002)