Development of New Photorefractive Polymer Materials.

摘要

The goal of this program was to develop highly efficient photorefractive (PR) polymer material for applications of interest to the Air Force. During the period of this report, we have demonstrated a new interdigitated coplanar geometry for the electrodes of the photorefractive device that enhances its sensitivity and allows diffraction with symmetrically incident beams, a configuration that was not possible with the conventional top and bottom electrodes. Related to this new electrode configuration, we measured the electric field strength inside the material with the help of a multiphoton microscope and were able to identify unsuspected asymmetry due to the photoconduction properties of the polymer matrix. The observed field nonlinearity has led to a revision of the theory governing the diffraction efficiency with coplanar electrode.