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Chiral Side Groups Trigger Second Harmonic Generation Activity in 3D Octupolar Bipyrimidine-Based Organic Liquid
Stijn van Cleuvenbergen1, Przemysław Kędziora2, Jean-Luc Fillaut3
1Department of Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200D and F, 3001, Leuven, Belgium.
Angewandte Chemie (International Ed. in English)
|July 5, 2017
Summary
Researchers developed new organic materials for nonlinear optics. These materials form self-oriented films with tunable properties, offering an alternative to inorganic crystals for advanced optical applications.
Area of Science:
- Organic nonlinear optics
- Materials science
- Liquid crystals
Background:
- Designing efficient noncentrosymmetric materials is crucial for organic second-order nonlinear optics.
- Organic materials offer advantages like fast electro-optical response and processability over inorganic crystals.
- Achieving noncentrosymmetric alignment in organic films remains a significant challenge.
Purpose of the Study:
- To develop novel organic materials for efficient second-order nonlinear optical applications.
- To overcome the challenge of aligning organic materials into noncentrosymmetric films.
- To create tunable macroscopic materials with nonlinear optical properties.
Main Methods:
- Functionalization of 3D organic octupoles to break symmetry.
- Development of multifunctional liquid crystalline chromophores.
- Processing into large, flexible, thin, and self-oriented films.
Main Results:
- Achieved self-oriented films with second harmonic generation responses competitive to inorganic crystals (KH2PO4).
- Demonstrated the liquid-crystalline nature of the chiral organic films.
- Showcased the ability to modulate nonlinear optical properties via temperature-induced changes in supramolecular organization.
Conclusions:
- Judicious functionalization enables the creation of advanced organic nonlinear optical materials.
- Liquid crystalline organic films offer a promising, tunable alternative to inorganic crystals.
- These materials pave the way for flexible, self-oriented, and temperature-responsive optical devices.
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