Orientational relaxation of three different dendrimers in polycarbonate matrix investigated by optical poling

We report on all-optical poling relaxation of E-O active dendrimers photo-patterned in the polycarbonate matrix. Three kinds of polyester type dendrimers G0, G1 and G2 containing azobenzene in the core were used as second-order nonlinear optical active chromophores to create noncentrosymmetry inside...

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Bibliographic Details
Published in:Journal of optics. A, Pure and applied optics Pure and applied optics, 2009-03, Vol.11 (3), p.034003-034003 (7)
Main Authors: Seniutinas, G, Laipniece, L, Kreicberga, J, Kampars, V, Gražulevičius, J, Petruškevičius, R, Tomašiūnas, R
Format: Article
Language:English
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Summary:We report on all-optical poling relaxation of E-O active dendrimers photo-patterned in the polycarbonate matrix. Three kinds of polyester type dendrimers G0, G1 and G2 containing azobenzene in the core were used as second-order nonlinear optical active chromophores to create noncentrosymmetry inside the material. We used a guest-host type system of these structures spin-coated on a glass substrate. These samples were poled by using an all-optical poling method, where the polar electric field of electromagnetic waves enables us to orient dendrimer molecules creating a quasi-phase-matched grating of nonlinear second-order susceptibility chi(2). Molecular orientation and subsequent dark relaxation kinetics in the samples with different poling beam applied energies were measured. Theoretical modeling of the poling relaxation kinetic revealed a set of characteristic time constants, which were interpreted by different relaxation mechanisms.
ISSN:1464-4258
1741-3567
DOI:10.1088/1464-4258/11/3/034003