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Resonant grating waveguide structures may find application as narrowband reflection filters. We present a theoretical approach for calculating the thermal shift in such devices. The results are compared to thermal shifts in classical multilayer stacks.

Subwavelength structures of sufficient height are capable to reduce the Fresnel reflection of surfaces. A new technique is presented to produce stochastic structures on polymer surfaces by low-pressure plasma-ion treatment, showing excellent broadband antireflective properties.

An in-situ broadband monitoring system to measure reflectance or transmittance of optical coatings deposited with IAD was developed. First results on the deposition of metal island layers and gradient refractive index layers are presented.

Gradient index films and rugate filters built of niobium pentoxide and silicon dioxide have been produced by IAD. The coatings have been characterized by cross-sectional electron microscopy and EELS, as well as optical spectroscopy.