Abstract
A synthetic/processing method has been developed for achieving highly efficient nonlinear optical polymers. A maleimide-containing chromophore with large molecular nonlinearity was covalently attached onto a anthrathene-containing polymer to generate in situ a side-chain polymer via the Diels-Alder reaction. The poling and covalent side-chain attachment processes can be performed simultaneously in a solid state, resulting in high electro-optic (E-O) coefficients (r33 values up to 50pm∕V at 1310nm) and temporal stability (85% retention of the original dipole alignment after isothermal heating at 85°C for more than 500h). A very high chromophore loading level (39wt%) can be achieved by adding more chromophore into this side-chain polymer without causing any obvious phase separation. Poling of this chromophore-doped side-chain polymer (total dye content: 34wt%) showed a significantly increased E-O coefficient, from 50to110pm∕V.
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