Abstract
The interest in the nonlinear optical (NLO) properties of the fullerenes lies in their unique structure and symmetry which are responsible for the three-dimensional delocalization of π-electrons, a property often associated with enhanced NLO properties in organic materials. At NRL, our studies have focussed on the NLO behavior of pristine films of the fullerenes in the near-infrared1,2 and visible3 spectral region. Recently, the group at Kentucky succeeded in polymerizing C60 by irradiation of oxygen-free, face-centered-cubic films with visible or ultraviolet light.4 It was found that oxygen plays an important role in the photochemistry of C60. We have recently reported on the photo-assisted diffusion of O2 into solid C60 as well as its photo-oxidation.5,6 The present paper addresses the effect of altering the electronic/chemical structure, achieved by O2-doping and photopolymerization, on the NLO properties of C60 and the dynamics of the NLO response.
© 1993 Optical Society of America
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