Ionized-Cluster Beam/Partially Ionized Beam Deposition of Electro-Optical and Nonlinear Optical Organic Materials and Device Development.

摘要

Our multidisciplinary research efforts over the last few years have been focused on the preparation and characterization of high quality, thermally stable thin film that exhibit high nonlinear optical properties using vacuum vapor deposition and in-situ poling (ionized cluster beam/partially ionized beam (PIB) deposition) techniques. The project's primary accomplishments are the vapor deposition of oriented organic thin films and polymer-chromophore complexes, and the development of novel nonlinear optical materials systems, such as side-chain polymers and particle-polymer complexes. Highlights of the research are as follows: (1) Organic crystals called DAST with the highest known nonlinearity have been grown and characterized; (2) PIB deposited highly transparent MNA films on FM substrates demonstrate a large second harmonic generation (SHG) signal; (3) Vapor deposited chromophore-polymer composite thin films show large EO effect (several pm/V); (4) Seven synthetic diol and triol chromophores developed have been copolymerized into polyurethane cross-linked EO polymer; (5) Vapor deposited polyurethane based side-chain polymeric thin film demonstrate large EO effects with r33 = 5.6 pm/V; (6) Spin-coated BaTiO3/PMMA composite thin film show large electrooptical effect; (7) Two novel techniques, electrooptical characterization and subpicosecond optical rectification, have been implemented. Ionized cluster beam, Nonlinear organics, Electro-Optic Thin Films, Polymer-chromophore, Vapor Deposition.