Refractive index dispersion measurement on nano-crystal and polymer composite Bi_4Ti_3O_(12)/PEK-c films

摘要

The compounding of NLO active units in polymer allows a higher nonlinear optical effect to be added on traditional polymer material and the overall intrinsic low dielectric constant can still be maintained after poling by an electric field [1]. Recently, we reported a preparation technique in compounding such Bi_4Ti_3O_(12) nano-crystals with polyetherketone (PEK-c) to form composite polymer material offering significant electrooptic property and low scattering loss [2]. In our case, Bi_4Ti_3O_(12) nano-crystals acted as the nonlinear chromophore (guest) in the NLO polymer system. The transparent polymer polyetherketone (PEK-c), which possesses a very high glass transition temperature (～228 ℃) and an intrinsic low dielectric coefficient (～3.2), is selected as the polymer host [3].