Non-Electric Field Photorefractive Effect Using Polymer Composites

We prepared photorefractive composites using poly(3,4-ethylenedioxythiophene)-block-polyethylene glycol (PEDOT-block-PEG) as a key material doped with nonlinear optical chromophore ((S)-(-)-l-(4-Nitrophenyl)-2-pyrrolidinemethanol (NPP). To adjust the optical absorbancc PMMA was used as a matrix. Photorefractive properties were characterized by means of a two beam coupling (2BC) method and a degenerated four wave mixing (DFWM) method. We successfully observed asymmetric 2BC under non-electric field: Photorefractive characteristics obtained are a net 2BC gain of 175 cm−1, a diffraction efficiency of 49%, and a phase shift of 90°. Furthermore, we could demonstrate its high performance by DFWM image processing experiment.