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

Paper Details

Date Published: 23 September 2016
PDF: 10 pages
Proc. SPIE 9939, Light Manipulating Organic Materials and Devices III, 99390G (23 September 2016); doi: 10.1117/12.2237203
Show Author Affiliations
Nick Van Steerteghem, KU Leuven (Belgium)
Stijn Van Cleuvenbergen, KU Leuven (Belgium)
Noor Aisyah Ahmad Shah, The Australian National Univ. (Australia)
Mark G. Humphrey, The Australian National Univ. (Australia)
Thierry Verbiest, KU Leuven (Belgium)
Koen Clays, KU Leuven (Belgium)

Published in SPIE Proceedings Vol. 9939:
Light Manipulating Organic Materials and Devices III
Joy E. Haley, Editor(s)

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