Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes

R. Kohlman, Victor I Klimov, M. Grigorova, X. Shi, B. R. Mattes, D. McBranch, H. Wang, F. Wudl, J. L. Nogués, W. Moreshead

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)

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 infrared 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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsZ.H. Kafafi
Pages72-82
Number of pages11
Volume3142
DOIs
Publication statusPublished - 1997
Eventfullerenes and Photonics IV - San Diego, CA, United States
Duration: Jul 28 1997Jul 29 1997

Other

Otherfullerenes and Photonics IV
CountryUnited States
CitySan Diego, CA
Period7/28/977/29/97

Keywords

  • C
  • Fullerenes
  • Optical limiting
  • Sol-gel glasses
  • Transient absorption

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

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    Kohlman, R., Klimov, V. I., Grigorova, M., Shi, X., Mattes, B. R., McBranch, D., Wang, H., Wudl, F., Nogués, J. L., & Moreshead, W. (1997). Ultrafast and nonlinear optical characterization of optical limiting processes in fullerenes. In Z. H. Kafafi (Ed.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3142, pp. 72-82) https://doi.org/10.1117/12.283754