Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes

Randolph S. Kohlman; Victor I. Klimov; M. Grigorova; X. Shi; Benjamin R. Mattes; Duncan W. McBranch; H. Wang; Fred Wudl; Jean-Luc R. Nogues; William V. Moreshead

doi:10.1117/12.283754

1 November 1997 Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes

Randolph S. Kohlman, Victor I. Klimov, M. Grigorova, X. Shi, Benjamin R. Mattes, Duncan W. McBranch, H. Wang, Fred Wudl, Jean-Luc R. Nogues, William V. Moreshead

Author Affiliations +

Proceedings Volume 3142, Fullerenes and Photonics IV; (1997) https://doi.org/10.1117/12.283754
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

We present recent results of broadband femtosecond (fs) transient absorption (TA) and broadband nanosecond (ns) optical limiting (OL) studies of C₆₀ and derivatized C₆₀. Improvements in measurement techniques for fs TA spectra provide sensitivity to 10^-5 in differential transmission, allowing detailed comparison of excited-state spectra with established energy level diagrams, as well as comparison of the ratio of triplet to singlet excited-state absorption cross sections from TA spectra with those obtained by modeling time transients at different wavelengths. For derivatized fullerenes, which provide enhanced solubility and a ground-state absorption extended into the IR compared with C₆₀ there is no spectral region where the triplet absorption cross section dominates the singlet as strongly as in C₆₀. Wavelength-dependent studies show that the OL response improves monotonically at longer wavelengths, demonstrating broadband limiting in all 6,6 mono-adducts and neat C₆₀. We report new approaches to processing sol-gel encapsulated fullerenes to improve the OL performance of solid-state materials to approach the response of solution limiters.

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Randolph S. Kohlman, Victor I. Klimov, M. Grigorova, X. Shi, Benjamin R. Mattes, Duncan W. McBranch, H. Wang, Fred Wudl, Jean-Luc R. Nogues, and William V. Moreshead "Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997); https://doi.org/10.1117/12.283754

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