An optical element is formed by co-extruding to have an arrangement of polymer scattering fibers within a polymer matrix. The scattering fibers lie substantially parallel to a first axis. The scattering fibers are arranged at positions across the cross-section of the polymer matrix to scatter light transversely...http://www.google.com/patents/US7362943?utm_source=gb-gplus-sharePatent US7362943 - Polymeric photonic crystals with co-continuous phases
