Nonlinear Optical and Charge Distribution Studies Probing Electric Field Effects in Polymer Thin Films for Second Order Nonlinear Optical Applications.

Abstract

Abstract : The effect of large magnitude electric fields on polymer thin films is investigated in order to improve poling efficiencies in polymer films for second order nonlinear optical applications. This research determines the charge distribution, symmetry, and magnitude across doped and undoped glassy polymer thin films as a function of temperature, time, and poling (processing). Electrochromism, second order nonlinear optics, dielectric relaxation, isothermal current and surface voltage decay measurements will be used to determine the material properties. Trapping levels and sites will also be examined. By using dielectric relaxation and optical techniques we will explore how applied electric fields affect rotational mobility of small chromophores in polymer hosts. We expect to be able to improve poling efficiency and thus device performance both by achieving the greatest possible fields with the best magnitude and symmetry characteristics, and enhancing the temporal and thermal properties of the films by manipulating their charge storage and transport properties. This understanding will allow the most efficient development and design for nonlinear optical materials. Second Order Nonlinear Optical Polymers, Electric field Effects, Polymer Dynamics.