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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 9358–9365

Grating dynamics in a photorefractive polymer with Alq3 electron traps

C. W. Christenson, J. Thomas, P.-A. Blanche, R. Voorakaranam, R. A. Norwood, M. Yamamoto, and N. Peyghambarian  »View Author Affiliations

Optics Express, Vol. 18, Issue 9, pp. 9358-9365 (2010)

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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.

© 2010 OSA

OCIS Codes
(050.7330) Diffraction and gratings : Volume gratings
(160.4890) Materials : Organic materials
(160.5320) Materials : Photorefractive materials

ToC Category:
Diffraction and Gratings

Original Manuscript: January 29, 2010
Revised Manuscript: April 7, 2010
Manuscript Accepted: April 12, 2010
Published: April 20, 2010

C. W. Christenson, J. Thomas, P.-A. Blanche, R. Voorakaranam, R. A. Norwood, M. Yamamoto, and N. Peyghambarian, "Grating dynamics in a photorefractive polymer with Alq3 electron traps," Opt. Express 18, 9358-9365 (2010)

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