From Event: SPIE Organic Photonics + Electronics, 2016
Present-day methods for determining the performance of third-order nonlinear optical materials include Z-scan, degenerate four-wave mixing and third-harmonic generation (THG). All these techniques possess severe drawbacks; for example, in THG, since all media (air and glass walls of the cell) present a third-order effect, eliminating these contributions requires careful, complex analysis or use of vacuum chambers. We have developed nonlinear scattering as a sensitive, straightforward technique for determining the second hyperpolarizability of samples in solution. Herein, we will for the first time show the applicability of the technique to measure organometallic Ru-complexes, optimized for high nonlinear responses. The investigated compounds showed a significant second hyperpolarizability |γ|, ranging from 1.1 for the least efficient to 2.8 ∙ 10-33 esu for the most efficient molecule, and comparable to fullerene C60 in thin films. It was deemed infeasible to extract hyperpolarizabilities using a high-frequency femtosecond laser source by a modified z-scan setup, which, in contrast to nonlinear scattering, could not account for the high degree of thermal lensing present in the investigated compounds.
Nick Van Steerteghem, Stijn Van Cleuvenbergen, Noor Aisyah Ahmad Shah, Mark G. Humphrey, Thierry Verbiest, and Koen Clays, "Investigation of the second hyperpolarizability of Ru-alkynyl complexes by z-scan and nonlinear scattering," Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390G (Presented at SPIE Organic Photonics + Electronics: September 01, 2016; Published: 23 September 2016); https://doi.org/10.1117/12.2237203.
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