Femtosecond excited-state absorption dynamics and optical limiting in fullerene solutions, sol-gel glasses, and thin films

Duncan W. McBranch; Victor I. Klimov; Laura B. Smilowitz; M. Grigorova; Jeanne M. Robinson; Aaron C. Koskelo; Benjamin R. Mattes; H. Wang; Fred Wudl

doi:10.1117/12.262976

16 December 1996 Femtosecond excited-state absorption dynamics and optical limiting in fullerene solutions, sol-gel glasses, and thin films

Duncan W. McBranch, Victor I. Klimov, Laura B. Smilowitz, M. Grigorova, Jeanne M. Robinson, Aaron C. Koskelo, Benjamin R. Mattes, H. Wang, Fred Wudl

Author Affiliations +

Proceedings Volume 2854, Fullerenes and Photonics III; (1996) https://doi.org/10.1117/12.262976
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

We compare detailed dynamics of the excited-state absorption for C60 in solution, thin films, and entrapped in an inorganic sol-gel glass matrix. Our results demonstrate that the microscopic morphology of the C60 molecule plays a crucial role in determining the relaxation dynamics. This is a key factor for applications in optical limiting for nanosecond pulses using reverse saturable absorption. We find that the dynamics of the C60-glass composite occur on long timescales, comparable to that in solution; thin film samples, by contrast, show rapid decay. These results demonstrate that the C60-sol-gel glass composites contain C60 in a molecular dispersion, and are suitable candidates for solid-state optical limiting. Multispectral analysis of the decay dynamics in solution allows accurate determination of both the intersystem crossing time and the relative strengths of the singlet and triplet excited-state cross sections as a function of wavelength from 450-950 nm. The triplet excited-state cross section is greater than that for the singlet excited-state over the range form 620-810 nm.

Citation Download Citation

Duncan W. McBranch, Victor I. Klimov, Laura B. Smilowitz, M. Grigorova, Jeanne M. Robinson, Aaron C. Koskelo, Benjamin R. Mattes, H. Wang, and Fred Wudl "Femtosecond excited-state absorption dynamics and optical limiting in fullerene solutions, sol-gel glasses, and thin films", Proc. SPIE 2854, Fullerenes and Photonics III, (16 December 1996); https://doi.org/10.1117/12.262976

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