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Nondegenerate four-wave mixing using photoinduced charge-transfer materials

United States Patent Application

View the Complete Application at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
Charge-transfer materials are demonstrated to be useful for generating femtosecond holographic gratings. Using semiconducting polymers sensitized with varying concentrations of C.sub.60, absorption holographic gratings with diffraction efficiencies of 1.6% were recorded with individual ultrafast laser pulses; the diffraction efficiency and time decay of the gratings were measured using nondegenerate four-wave mixing. High quantum efficiency for electron transfer reduces the effects of early recombination which otherwise limits the density of excitations in pure polymers, and the metastability of the charge transfer enables tuning of the decay dynamics by controlling the concentration of acceptors in the mixture.
Maniloff, Eric S. (Eugene, OR), McBranch, Duncan W. (Santa Fe, NM), Heeger, Alan J. (Santa Barbara, CA), Vacar, Dan V. (Goleta, CA)
09/ 973,170
October 4, 2001
[0002] This invention was made with government support under Contract No. W-7405-ENG-36 awarded by the U.S. Department of Energy to The Regents of the University of California and under Contract No. F49620-95-0395 awarded by the Air Force Office of Scientific Research to The Regents of the University of California. The government has certain rights in the invention.