Abstract

Solution-deposited polymer films with continuously adjustable refractive index (1.489−1.563) are made by blending in solution two polymers: polymethyl methacrylate (PMMA) and styrene-acrylonitrile copolymer (SAN). The dependence of index of refraction on composition was found to be linear, indicating the compatibility of the two polymers on a molecular basis. In films ~2 μm thick losses less than 0.2 dB/cm were measured. For thicker films (3.5 μm) an increased scattering loss was observed in high SAN content films.

© 1973 Optical Society of America

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