title: Analysis of non-quarter-wave grating by a modified Fourier-transform method.
abstract: When unity reflectance is approached, the Fourier-transform method of calculating the reflectance spectrum of an optical grating modulated by a slowly varying envelope becomes unacceptably inaccurate. The modified Fourier transform method of Bovard [Appl. Opt. 29, 24 (1990)] can achieve complete accuracy for quarter-wave gratings. We report herein the extension of Bovard's method to non-quarter-wave gratings. We demonstrate the accurate deployment of our simplified modified Fourier-transform method to apodized linear gratings and optically apodized nonlinear gratings.
authors.affiliation: Department of Electrical and Computer Engineering, University of Toronto, Ontario, Canada. tim.wong@utoronto.ca
authors.forename: Tim K L
authors.initials: TK
authors.lastname: Wong
authors.forename: Lukasz
authors.initials: L
authors.lastname: Brzozowski
authors.forename: Edward H
authors.initials: EH
authors.lastname: Sargent