Improved quantum-dot-sensitized photorefractive polymer composite

Sarah P. Bant; David J. Binks; David P. West; Paul O'Brien; M. Azad Malik

doi:10.1117/12.452419

5 November 2002 Improved quantum-dot-sensitized photorefractive polymer composite

Sarah P. Bant, David J. Binks, David P. West, Paul O'Brien, M. Azad Malik

Proceedings Volume 4802, Organic Photorefractive and Photosensitive Materials for Holographic Applications; (2002) https://doi.org/10.1117/12.452419
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

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.

Citation Download Citation

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); https://doi.org/10.1117/12.452419

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