The preparation of layered structures of polymers by coextrusion is well known. It is possible to fabricate a material containing many thousands of alternating layers of polymers with a layer thickness ranging from many microns to 10 nm [1]. When different polymers are used for the alternating layers, the new materials possess a modulation in the refractive index, n, across the polymer film. When the modulation period is λ/4n, the materials show a high reflectivity at the wavelength, λ. They are effective 1D photonic crystal materials. When the layer thickness is substantially less than λ/4n, the optical properties are that of an effective medium composite. The refractive index and transmission are then an average of those of the component materials.

© 2003 Optical Society of America

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