10 October 1997 Optical limiting over an extended spectral region by derivatization of C60
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Abstract
The optical limiting performance of C60 is shown to be extended to longer wavelengths by derivatization of the fullerene. While the reverse saturable absorption behavior of C60 generally improves at wavelengths longer than 532 nm due to decreased ground state absorption and increased excited state absorption, the peak of the triplet-triplet excited state absorption at 750 nm is inaccessible as a result of the near complete transparency of C60 beyond 650 nm. Partial breaking of the spherical it-conjugation by attached substituents leads to increased ground state absorption cross-sections in the appropriate wavelength range. The peak of the triplet-triplet absorption is shifted to 700 nm in the C60 derivatives, resulting in exceptionally strong optical limiting in this spectral region.
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James Randy Heflin, James Randy Heflin, Daniela Marciu, Daniela Marciu, Charles Figura, Charles Figura, S. Wang, S. Wang, R. Yordanov, R. Yordanov, James C. Withers, James C. Withers, } "Optical limiting over an extended spectral region by derivatization of C60", Proc. SPIE 3146, Nonlinear Optical Liquids and Power Limiters, (10 October 1997); doi: 10.1117/12.284160; https://doi.org/10.1117/12.284160
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