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Proceedings Paper

Cross-linked polyimides for integrated optics
Author(s): Kenneth D. Singer; Tony C. Kowalczyk; Hung D. Nguyen; Allyson J. Beuhler; David A. Wargowski
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Paper Abstract

We have investigated crosslinkable polyimides for both passive and active electro-optic devices. These fluorinated polyimides are soluble in the imidized form and are both thermally and photo-crosslinkable leading to easy processability into waveguide structures and the possibility of stable electro-optic properties. We have fabricated channel and slab waveguides and investigated the mechanism of optical propagation loss using photothermal deflection spectroscopy and waveguide loss spectroscopy, and found the losses to arise from residual absorption due to the formation of charge transfer states. The absorption is inhibited by fluorination yielding propagation losses as low as 0.4 dB/cm in the near infrared. Channel waveguides formed by a simple wet etch process are observed to have no excess loss over slab structures. We have produced electro-optic polymers by doping with the nonlinear optical chromophores, DCM and DADC; and a process of concurrent poling and thermal crosslinking. Multilayer structures have been investigated and poling fields optimized in the active layer by doping the cladding with an anti-static agent.

Paper Details

Date Published: 29 July 1997
PDF: 23 pages
Proc. SPIE 10290, Sol-Gel and Polymer Photonic Devices: A Critical Review, 102900I (29 July 1997); doi: 10.1117/12.279825
Show Author Affiliations
Kenneth D. Singer, Case Western Reserve Univ. (United States)
Tony C. Kowalczyk, NASA Lewis Research Ctr. (United States)
Hung D. Nguyen, NASA Lewis Research Ctr. (United States)
Allyson J. Beuhler, Amoco Chemical Co. (United States)
David A. Wargowski, Amoco Chemical Co. (United States)

Published in SPIE Proceedings Vol. 10290:
Sol-Gel and Polymer Photonic Devices: A Critical Review
Mark P. Andrews; S. Iraj Najafi, Editor(s)

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