Investigation of the second hyperpolarizability of Ru-alkynyl complexes by z-scan and nonlinear scattering

Nick Van Steerteghem; Stijn Van Cleuvenbergen; Noor Aisyah Ahmad Shah; Mark G. Humphrey; Thierry Verbiest; Koen Clays

doi:10.1117/12.2237203

23 September 2016 Investigation of the second hyperpolarizability of Ru-alkynyl complexes by z-scan and nonlinear scattering

Nick Van Steerteghem, Stijn Van Cleuvenbergen, Noor Aisyah Ahmad Shah, Mark G. Humphrey, Thierry Verbiest, Koen Clays

Author Affiliations +

Proceedings Volume 9939, Light Manipulating Organic Materials and Devices III; 99390G (2016) https://doi.org/10.1117/12.2237203
Event: SPIE Organic Photonics + Electronics, 2016, San Diego, California, United States

Abstract

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.

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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 (23 September 2016); https://doi.org/10.1117/12.2237203

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