Hybrid Quantum-Dot–Polymer Nanocomposites for Infrared Photorefractivity at an Optical Communication Wavelength


  • This research was supported in part by a Defense University Research Initiative on Nanotechnology (DURINT) grant, 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. Marek Samoc for his critical reviewing of the manuscript and his helpful comments.


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A multifunctional hybrid photorefractive nanocomposite has been developed (see Figure); it consists of a carbazole-based photoconducting matrix, a nonlinear chromophore, and suitably size-tuned PbSe quantum dots with spectral response at the optical communication wavelength of 1550 nm. Efficient harvesting of IR photons in the device leads to good photoconductivity, high net optical gain, and significant diffraction efficiency at the operating wavelength.