Browsing by Author "Lucchetta, DE"

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Nano-Size Polymer Dispersed Liquid Crystals for Phase-Only Optical Modulation
(Taylor & Francis Ltd, 2002) Lucchetta, DE; Manni, A; Karapinar, R; Gobbi, L; Simoni, F
In this work we report the preparation details and the electro-optical characterization of a new class of nanometer-sized PDLC obtained by using a multifunctional monomer in a pre-polymer mixture which is suitable for fast polymerization process. A systematic analysis of the sample morphology has been carried out on a large number of samples characterized by different values of the photoinitiator concentration and curing parameters. These samples have high transparency to the visible light. However, reorientation of the liquid crystal domains due to the application of a suitable voltage can affect the optical phase shift making these materials suitable as polarization independent "phase only" optical modulators.
Phase-Only Modulation by Nanosized Polymer-Dispersed Liquid Crystals
(Amer inst Physics, 2002) Lucchetta, DE; Karapinar, R; Manni, A; Simoni, F
We report the preparation methods and electro-optical characterization of polymer-dispersed liquid crystals with nanosized liquid crystal domains obtained by using a multifunctional monomer in a prepolymer mixture that is suitable for a fast photopolymerization process. The electric-field-induced optical phase shift has been measured using a Mach-Zender interferometer, getting values up to pi/2 with an applied voltage of about 20 V/mum with no dependence on the light polarization. The high transmittance of the samples make them suitable for photonic devices and telecom applications. (C) 2002 American Institute of Physics.