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5 November 2002 Improved quantum-dot-sensitized photorefractive polymer composite
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Quantum dots have significant potential as photosensitizers with a range of possible surface structures and a variety of materials available. Quantum dots composed of a cadmium selenide (CdSe) core and a cadmium sulfide (CdS) shell have been combined with poly(N-vinylcarbazole) and electro-optic dye molecules to form a new photorefractive composite. The photorefractive nature of the material was demonstrated with a gain of 4 cm-1 in s-polarized asymmetric two-beam coupling. The photosensitizing ability of CdS nanoparticles in a photorefractive polymer composite has been previously only evident for larger applied fields. The diffraction efficiency of the current composite is a vast improvement over the quantum dot composite reported previously, with degenerate four-wave mixing yielding diffraction of 1.3% at 70V/μm. Analysis of the field-dependence of the space-charge field rise time reveals a zero-field dissociation efficiency of (3.6+/-0.5)x10-5. Other example quantum dot sensitizers are also under investigation.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Sarah P. Bant, David J. Binks, David P. West, Paul O'Brien, and M. Azad Malik "Improved quantum-dot-sensitized photorefractive polymer composite", Proc. SPIE 4802, Organic Photorefractive and Photosensitive Materials for Holographic Applications, (5 November 2002);


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