Enhancement of effective second-order nonlinearity in poled polymers by introducing the chromophores with low ground state dipole moment

The strategy of introducing the chromophores with low ground state dipole moment had been discussed to overcome the effect of the electrostatic interaction between the chromophores in the poled polymer films on its nonlinearity. As a result, the effective nonlinear optical coefficient d(33) of the poled films, containing the chromophores with mu(g) in the range of 3.5-5.5 D, will enhance at least 15%, even over 30%, compared to that of 7.5 D if the first hyperpolarizabilities (beta) of chromophores are in the same magnitudes. And, under the above assumption, the same level of the d(33) could even be achieved by utilizing the chromophores with mu(g) as low as 2.2 D.