Photofabrication of surface relief gratings from azobenzene containing perfluorocyclobutane aryl ether polymer

Abstract

An azobenzene based perfluorocyclobutane (PFCB) aryl ether polymer, poly[4-(phenylazo)triphenylamine-1,2-hexafluorocyclobutyl ether], was synthesized by using a palladium catalyzed amination reaction and the 2 pi + 2 pi cyclodimerization of 4-[(trifluorovinyl)oxy]bromobenzene. This polymer was designed and synthesized to permit azo chromophores to be incorporated, thus introducing photoinduced dynamic behavior into the PFCB containing polymer structure. The polymer exhibited a T-g of about 122 degrees C, and the maximum absorption of the azo chromophores was 407 nm in the film state. A thin film was prepared through a spin coating process, and the rapid growth of diffraction efficiency was then achieved by irradiation with an interference beam. The efficient formation of holographic surface relief gratings was also verified from AFM images, which show regularly defined and aligned grating structures. (c) 2005 Wiley Periodicals, Inc.