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Proceedings Paper

Femtosecond excited-state absorption dynamics and optical limiting in fullerene solutions, sol-gel glasses, and thin films
Author(s): Duncan W. McBranch; Victor I. Klimov; Laura B. Smilowitz; M. Grigorova; Jeanne M. Robinson; Aaron C. Koskelo; Benjamin R. Mattes; H. Wang; Fred Wudl
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Paper 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.

Paper Details

Date Published: 16 December 1996
PDF: 11 pages
Proc. SPIE 2854, Fullerenes and Photonics III, (16 December 1996); doi: 10.1117/12.262976
Show Author Affiliations
Duncan W. McBranch, Los Alamos National Lab. (United States)
Victor I. Klimov, Los Alamos National Lab. (United States)
Laura B. Smilowitz, Los Alamos National Lab. (United States)
M. Grigorova, Los Alamos National Lab. (United States)
Jeanne M. Robinson, Los Alamos National Lab. (United States)
Aaron C. Koskelo, Los Alamos National Lab. (United States)
Benjamin R. Mattes, Los Alamos National Lab. (United States)
H. Wang, Univ. of California/Santa Barbara (United States)
Fred Wudl, Univ. of California/Santa Barbara (United States)


Published in SPIE Proceedings Vol. 2854:
Fullerenes and Photonics III
Zakya H. Kafafi, Editor(s)

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