Orientational Relaxation of Three Different Dendrimers in Polycarbonate Matrix Investigated by Optical Poling
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- IOP PUBLISHING
Abstract
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 χ(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