Grating dynamics in a photorefractive polymer with Alq3 electron traps

C. W. Christenson, J. Thomas, Pierre Alexandre Blanche, R. Voorakaranam, Robert A Norwood, M. Yamamoto, Nasser N Peyghambarian

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21 Scopus citations


The electron transporting molecule tris(8-hydroxyquinoline) aluminum (Alq3) was added in low concentrations to a photorefractive polymer composite to provide trapping sites for electrons. This sample exhibited larger two-beam coupling gain, higher diffraction efficiency at lower voltages, and an increased dielectric breakdown strength compared to a control sample. The dynamics also revealed the presence of a competing grating, and a bipolar charge transport model is shown to fit the data. Overall, Alq3 improves the response time, efficiency, and breakdown voltage without a significant increase in absorption or loss of phase stability. This has applications for reflection displays and pulsed writing, where charge trapping and generation are major factors limiting the usefulness of photorefractive polymers.

Original languageEnglish (US)
Pages (from-to)9358-9365
Number of pages8
JournalOptics Express
Issue number9
Publication statusPublished - Apr 26 2010


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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