Accession Number : ADP008174
Title : Electro Optic Polyimide Thin Films for Integrated Photonic Interconnects on Silicon,
Corporate Author : LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB
Personal Author(s) : Valley, J. F. ; WU, J. W. ; Ermer, S ; Stiller, M. ; Culbert, D. L.
Report Date : APR 1992
Pagination or Media Count : 2
Abstract : Using dielectric relaxation spectroscopy we have determined that commercially available polyimides exist which are highly suitable as hosts for nonlinear optical (NLO) molecules. In general, polyimides offer excellent thermal and mechanical properties as a host material but have, until now, presented some difficulties in the poling process. We now process and pole polyimide thin films similarly to the techniques used in our successes with electro-optic waveguide devices made from methacrylate based material systems. The transition from glassy to rubbery states in the Hitachi LQ2200 optical quality polyimide (available for use in liquid crystal displays) occurs near 250 deg C. We have found NLO molecules compatible with LQ2200 that shift the glass transition temperature, Tg, down (up) by plasticization (anti-plasticization) of the host correlating to the NLO molecules melting temperature being lower (higher) than the Tg of the pure host LQ2200. So far, the only NLO molecules which yield sufficiently strong poled response for the compact, complex integrated photonic interconnects we invision plasticize the host.
Descriptors : *POLYIMIDE PLASTICS, *OPTICAL WAVEGUIDES, *OPTICAL MATERIALS, DIELECTRICS, FILMS, GLASS, LIQUID CRYSTALS, MECHANICAL PROPERTIES, MELTING, METHACRYLATES, MOLECULES, OPTICS, PHOTONICS, QUALITY, RELAXATION, RESPONSE, SPECTROSCOPY, THIN FILMS, TRANSITION TEMPERATURE, YIELD.
Subject Categories : Plastics
Distribution Statement : APPROVED FOR PUBLIC RELEASE