Inverse Fourier transform method has been commonly used for designing complex inhomogeneous optical coatings. Since it assumes dispersion-free optical constants, introducing real optical materials induces shifts in the position of reflectance bands in multiband inhomogeneous minus (rugate) filters. We propose a simple method for considering optical dispersion in the synthesis of multiband rugate filter designs. Model filters designed with this method were fabricated on glass and polycarbonate substrates by plasma-enhanced chemical vapor deposition of silicon oxynitrides and SiO<sub>2</sub>/TiO<sub>2</sub> mixtures with precisely controlled composition gradients.
© 2002 Optical Society of America
(080.2710) Geometric optics : Inhomogeneous optical media
(080.2740) Geometric optics : Geometric optical design
(260.2030) Physical optics : Dispersion
(310.1620) Thin films : Interference coatings
(310.1860) Thin films : Deposition and fabrication
Daniel Poitras, Stéphane Larouche, and Ludvik Martinu, "Design and Plasma Deposition of Dispersion-Corrected Multiband Rugate Filters," Appl. Opt. 41, 5249-5255 (2002)