The plasma-enhanced chemical vapor deposition of optical coatings on plastic substrates leads to the formation of a physically thick (≈50–100-nm) interfacial region (or interphase). We propose, based on our earlier spectroellipsometric (<i>in situ</i> and <i>ex situ</i>) and spectrophotometric (<i>ex situ</i>) studies, an optical model for the description of the interphase refractive-index profile <i>n</i>(<i>z</i>). We study in detail the effect of such an interphase on the spectral performance of various optical filters (antireflective V-coat, W-coat, achromatic W-coat, and minus filter). It is shown that considering the inhomogeneous <i>n</i>(<i>z</i>) profile in the design can improve the optical performance of some filters.
© 2000 Optical Society of America
(160.5470) Materials : Polymers
(310.0310) Thin films : Thin films
(310.1620) Thin films : Interference coatings
(310.6860) Thin films : Thin films, optical properties
(350.5400) Other areas of optics : Plasmas
Daniel Poitras and Ludvik Martinu, "Interphase in Plasma-Deposited Films on Plastics: Effect on the Spectral Properties of Optical Filters," Appl. Opt. 39, 1168-1173 (2000)