Optical nonlinearities of C84 fullerenes

The third-order nonlinear optical response of fullerene C84 (isomeric mixture as obtained from fullerenic soot) and its isomer C84-D2d (II) dissolved in toluene were studied using nanosecond and picosecond laser pulses employing the Z-scan and the Optical-Kerr-effect techniques. The nonlinear absorption and refraction parameters and the corresponding second hyperpolarizability γ were determined, while the origins of the observed nonlinear optical response are discussed.

Concentration dependence of the real part of the third-order susceptibility of fullerenes C84 and C84-D2d dissolved in toluene, under 8 ns, 532 nm laser excitation.