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A Novel Poling Process for Polymeric Thin Films Exhibiting Second Harmonic Generation
Published online by Cambridge University Press: 15 February 2011
Abstract
Carbon dioxide is used to induce glass transition in amorphous polymer films, allowing efficient alignment of chromophores with an applied electric field. The noncentrosymmetric films thus produced are capable of second harmonic generation (SHG). This method has advantages over previously investigated poling schemes, including poling at ambient temperatures and use of high glass transition temperature polymers. Several polymeric systems have been studied. The chromophrores were either dissolved in the polymer, attached as a side chain, or incorporated into the backbone of the polymer. The SHG of the films was observed as a function temperature. Of the systems studied, polyether sulfone retains SHG capability to the highest temperature. Two different systems had the greatest retention of SHG up to the glass htansition temperature. They were Poly((4-N-ethylene-N-ethylamino)- rz-cyanocinnamate), a polymer which has the chromophore incorporated in the backbone, and 4- (dimethylamino)-4'-(dimesitylboro)azobenzene, a host-guest system with a relatively large chromophore. These and other systems will be discussed.
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- Copyright © Materials Research Society 1992
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