Nonlinear optical properties of chemically modified fullerenes

Zakya H. Kafafi; Steven R. Flom; H. W. Sarkas; Richard G. S. Pong; Charles D. Merritt; Filbert J. Bartoli

doi:10.1117/12.196123

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28 November 1994 Nonlinear optical properties of chemically modified fullerenes

Zakya H. Kafafi, Steven R. Flom, H. W. Sarkas, Richard G. S. Pong, Charles D. Merritt, Filbert J. Bartoli

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Proceedings Volume 2284, Fullerenes and Photonics; (1994) https://doi.org/10.1117/12.196123
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The resonant nonlinear optical (NLO) properties and excited state dynamics of pristine, chemically and photochemically modified C₆₀ are studied at 590.5 nm by time-resolved degenerate four-wave mixing and nonlinear transmission. The chemically modified fullerenes consist of (a) composite films of C₆₀ with meso-tetraphenyl porphine (TPP) prepared by vacuum vapor deposition, and (b) spin-coated films of solutions of C₆₀ mixed with the conjugated polymer, poly-[2-methoxy,5-(2'-ethylhexyloxy)-p-phenylenevinylene] (MEH-PPV). The photochemically modified fullerene, poly-C₆₀, is a distribution of oligomers of single C₆₀ molecules proposed to be linked together through four-membered rings. Photopolymerization of C₆₀ leads to an enhancement of its physical properties without substantial alteration of its NLO properties. C₆₀ and TPP form a ground state charge transfer complex with an enhanced NLO response. C₆₀ and MEH-PPV form a charge transfer complex in the excited state which gives rise to more than an order of magnitude increase in the NLO response and the figure of merit. The dynamics of the NLO response for C₆₀, poly-C₆₀, C₆₀:TPP, and C₆₀:MEH-PPV films show strong fluence dependence. Bimolecular decay via exciton-exciton annihilation dominates the temporal response at high-fluence.

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Zakya H. Kafafi, Steven R. Flom, H. W. Sarkas, Richard G. S. Pong, Charles D. Merritt, and Filbert J. Bartoli "Nonlinear optical properties of chemically modified fullerenes", Proc. SPIE 2284, Fullerenes and Photonics, (28 November 1994); https://doi.org/10.1117/12.196123

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