Photorefractive properties and applications of polymer composites and fully functionalized polymethacrylates

Eric Hendrickx, David Van Steenwinckel, Christiaan Engels, Elke Gubbelmans, Kurt Van den Broeck, David Beljonne, Jean-Luc Bredas, Celest Samyn, André Persoons*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We have studied the photorefractive properties of (2,4,7-trinitro-9-fluorenylidene)malononitrile (TNFM) sensitized poly(N-vinyl-carbazole) (PVK)/N-ethylcarbazole (ECZ) polymer composites doped with two structurally related chromophores. Characterization included four-wave mixing experiments, two-beam coupling and photoconductivity measurements at a wavelength of 780 nm. At an applied field of 48 V/μm, we have observed complete internal diffraction and gain coefficients exceeding 120 cm-1. A small alteration in the chromophore donor group substituents was used to tune the ionization potential of the dopant dye. This affected the grating build-up time and photorefractive phase shift. As an application, we demonstrate the operation of a photorefractive novelty filter using a 120-μm-thick sample. The performance of the polymer composites is compared to that of three newly synthesized polymethacrylates functionalized with carbazole, a dodecyl chain as an internal plasticizer and three different dyes. Here, we have observed net two-beam coupling gain and a diffraction efficiency of 60% at 58 V/μm.

Original languageEnglish (US)
Article number620
Pages (from-to)25-35
Number of pages11
JournalMaterials Science and Engineering C
Volume18
Issue number1-2
DOIs
StatePublished - Jan 1 2001

Keywords

  • Novelty filter
  • Photorefractive polymers
  • Real-time holography

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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