Showing papers by "Simona Concilio published in 1999"
TL;DR: A concise synthesis and characterization of a series of donor−acceptor chromophores incorporating a bithiophene moiety in the conjugated bridge are described, which display a suitable thermal stability and significantly enhanced molecular nonlinearity as compared to their monothiophene analogues.
105 citations
TL;DR: In this article, the phase behavior of all polymers has been investigated by DSC, X-ray diffraction and polarizing microscopy: two of them exhibit liquid crystalline behavior of smectic type.
Abstract: Acrylate-methylmethacrylate copolymers have been synthesized for nonlinear optical applications. Acrylate monomer units are characterized by the presence in the side chain of phenylbenzoxazole groups containing electron donor-electron acceptor substituents. The phase behavior of all polymers has been investigated by DSC, X-ray diffraction and polarizing microscopy: two of them exhibit liquid crystalline behavior of smectic type. For four polymers, nonlinear optical properties have been examined by second harmonic generation measurements on thin films (∼ 1 μm thickness) electrically poled by corona discharge. Second order susceptibility coefficients d33 and average relaxation times 〈τ〉, relative to the time stability of the chromophore poling, have been measured. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 603–608, 1999
31 citations
TL;DR: The second harmonic generation (SHG) measurements were evaluated by second-order nonlinear optical properties of two corona poled polymer films were evaluated as mentioned in this paper with an incident radiation of 1542 nm.
28 citations