Efficient Photosensitization and High Optical Gain in a Novel Quantum-Dot-Sensitized Hybrid Photorefractive Nanocomposite at a Telecommunications Wavelength

Authors

  • K. Roy Choudhury,

    1. Institute for Lasers, Photonics, and Biophotonics, Departments of Physics and Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA
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  • Y. Sahoo,

    1. Institute for Lasers, Photonics, and Biophotonics, Departments of Physics and Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA
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  • S. Jang,

    1. Institute for Lasers, Photonics, and Biophotonics, Departments of Physics and Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA
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  • P. N. Prasad

    1. Institute for Lasers, Photonics, and Biophotonics, Departments of Physics and Chemistry, State University of New York at Buffalo, Buffalo, NY 14260, USA
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  • This research was supported in part by a Defense University Research Initiative on Nanotechnology (DURINT), Contract No. F496200110358, through the Directorate of Chemistry and Life Sciences of the Air Force Office of Scientific Research and in part by a NSF, DMR Solid State and Polymer Chemistry Grant No. DMR0075867. The authors thank Dr. Jeffrey Winiarz for his advice at different stages of the project and Dr. Marek Samoc for his critical review of this manuscript and his valuable comments and suggestions.

Abstract

A high-performance hybrid polymeric photorefractive nanocomposite operating at the telecommunications wavelength of 1.34 μm is presented. The photorefractive nanocomposite is sensitized with PbS nanocrystals synthesized via a hot colloidal route. Photoconductivity experiments confirm and quantify the photocharge-generation quantum efficiency of the nanocrystals. A pronounced two-beam coupling effect at the operation wavelength is observed, leading to very high optical gains. Temporal evolution of the photorefractive growth process is also studied.

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