Abstract
We review our results from spectral studies of the ultrafast excited-state absorption in fullerenes and derivatized fullerenes. These results allow determination of both the spectral response of reverse saturable absorption (RSA) nonlinearities such as optical limiting (OL) in fullerenes, and the dynamical response for different morphologies. We have investigated the effects of thin film and various sol-gel glass environments on the nanosecond OL and femtosecond dynamics of derivatized fullerenes. These data provide evidence of decay pathways which compete with the intersystem crossing to a triplet from the initial singlet states. With appropriate processing, however, the OL response of derivatized-fullerene sol-gel glasses can be enhanced to approach that of the same molecule in solution, while significantly enhancing the optical damage threshold. The optical limiting of these derivatized fullerenes is compared with that of various porphyrin and phthalocyanine molecules.
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Acknowledgement
This work was supported in part by LANL Directed Research and Development funds and Collaborative University of California/ Los Alamos Research funds, under the auspices of the U.S. DOE. Additional funding was provided by the U.S. Army Small Business Technology Transfer program, under contract DAAH04-96-C-0077.
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Kohlman, R., Klimov, V., Shi, X. et al. Optical Limiting Processes in Derivatized Fullerenes and Porphyrins/Phthalocyanines. MRS Online Proceedings Library 488, 237–242 (1997). https://doi.org/10.1557/PROC-488-237
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DOI: https://doi.org/10.1557/PROC-488-237