Photorefractive Materials, from Polymer to Hyper-Structured Molecule
A series of amorphous polyphosphazenes containing carbazole-based multifunctional chromophores and two hyper-structured photorefractive molecular glasses with a cyclotriphosphazene core were synthesized. These photorefractive polymers and molecular glasses show low glass transition temperature (20-90oC) and can easily be fabricated into optically transparent films with long-term stability. Results of two-beam-coupling and four-wave-mixing experiments demonstrated that high gain coefficient and diffraction efficiency were achieved at zero electric field for samples fabricated with these materials.
Joong Hee Lee
L. Zhang et al., "Photorefractive Materials, from Polymer to Hyper-Structured Molecule", Advanced Materials Research, Vols. 123-125, pp. 871-874, 2010