Photorefractive organic glasses based on a new chromophore with minimized aggregation tendency

Ruediger W. Wortmann; Mesfin Redi-Abshiro; Ulrich Roesch; Sheng Yao; Frank Wuerthner

doi:10.1117/12.453483

5 November 2002 Photorefractive organic glasses based on a new chromophore with minimized aggregation tendency

Ruediger W. Wortmann, Mesfin Redi-Abshiro, Ulrich Roesch, Sheng Yao, Frank Wuerthner

Proceedings Volume 4802, Organic Photorefractive and Photosensitive Materials for Holographic Applications; (2002) https://doi.org/10.1117/12.453483
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

A photorefractive (PR) organic glass based on the chromophore IDOP-20 is reported. The electronic structure of this merocyanine dye was tuned close to the cyanine limit to optimize the anisotropy of the linear polarizability δα and to achieve a large PR figure-of-merit. The carefully chosen aliphatic side chains of the chromophore prevent dipolar aggregation even at very high concentrations in liquid solution and provide excellent compatibility with polymer matrices. IDOP-20 also forms a stable glass with glass transition temperature of T_g=58^o C. Mixtures with the plasticizer DPP were prepared to adjust the glass transition temperature close to room temperature. Such mixtures showed PR response after sensitization with TNFM where sensitization occurred through a CT band between TNFM and IDOP-20 and charge transport was supported by the multifunctional by IDOP-20. A PR glass of composition IDOP-20:DPP:TNFM 69:30:1 wt% was studied by a complete set of holographic-optical experiments (two-beam coupling and four-wave mixing), (photo)conductivity measurements and ellipsometric measurements. The performance of the new PR glasses is discussed with respect to similar materials based on the ATOP chromophore. The (mono-exponential) response time of the material is strongly temperature dependent and limited by chromophore reorientation.

Citation Download Citation

Ruediger W. Wortmann, Mesfin Redi-Abshiro, Ulrich Roesch, Sheng Yao, and Frank Wuerthner "Photorefractive organic glasses based on a new chromophore with minimized aggregation tendency", Proc. SPIE 4802, Organic Photorefractive and Photosensitive Materials for Holographic Applications, (5 November 2002); https://doi.org/10.1117/12.453483

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KEYWORDS

Chromophores

Glasses

Refractive index

Absorption

Electro optics

Composites

Four wave mixing

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