Abstract

Resonant waveguide-grating filters are of interest for a range of potential applications.^1,2 Although such filters exhibit high reflectance under a plane wave incidence, reflectance reduction and spatial modification of the beam profile occur under a practical finite beam illumination. This stems from the narrow angular linewidth of the filter. Incorporation of a first-order Bragg grating widens the angular aperture⁴ and improves filter properties as the calculations presented in this paper illustrate.

© 2001 Optical Society of America