title: Measured TM-TM coupling in waveguide gratings.
abstract: We report measurements of the guided-wave reflectivity of a periodic, surface-corrugation, waveguide grating as a function of incidence angle and polarization. We show that the measured response is more accurately described by a coupled-mode theory based on the local-normal-mode expansion of the fields than by that based on the ideal-mode expansion.
authors.forename: L A
authors.initials: LA
authors.lastname: Weller-Brophy
authors.forename: D G
authors.initials: DG
authors.lastname: Hall