Abstract
We report on third-order nonlinear properties of triphenylmethane derivative dyes by measuring third-harmonic generation (THG) for fundamental wavelengths within the range 1100–1800 nm. Our studies show that the triphenylmethane dyes Crystal Violet and Ethyl Violet, with a multidirectional charge transfer in their three-fold symmetry structure (octupolar dimensionality), exhibit a third-order nonlinear susceptibility of the order χ (3) ∼ 10 −12 esu when are used as dopants in polymer films. These films, with low residual absorption and anomalous refractive index dispersion for harmonic wavelengths, exhibit efficient THG as a bulk effect. The films are good candidates for ultra-fast optical correlators.
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