Mode conversion and filtering of bound modes in planar waveguide Bragg reflectors

A formalism for computing the reflectivity at oblique incidence of grating Bragg reflectors in integrated optics is developed. Attention is focused on the wavelength region near the Bragg wavelengths, where efficient reflection and strong Te-TM mode coupling occurs. The waveguide fields are expanded in normal modes of a waveguide film without the grating, and an answer is given to the question of how to define this film. Polarization resolved reflectivity spectra for a number of Bragg reflectors are calculated, and implications for device design in integrated optics are discussed.<
>