Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 24, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3453659
Keywords
dielectric polarisation; dielectric thin films; electrodes; electro-optical effects; leakage currents; optical polymers; polymer films; sol-gel processing; spin coating; titanium compounds; transparency
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Funding
- DARPA [N000140510824]
- Office of Naval Research (ONR) [N00014-08-1-1129]
- National Science Foundation (NSF) [DMR-0120967]
- Boeing-Johnson Foundation
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A sol-gel derived thin titanium dioxide (TiO2) layer was spin-coated onto indium-tin-oxide substrate to improve poling efficiency of recently developed electro-optic (E-O) polymers. The thin TiO2 layer significantly blocks excessive charge injection and reduces the leakage current during high field poling. Ultralarge E-O coefficients, up to 160-350 pm/V at 1310 nm, have been achieved. These results show higher poling efficiency (enhancement of 26%-40%) compared to the results of poled films without the TiO2 layer. This enhancement can be explained by field distribution flattening effect at high injection barrier with the insertion of TiO2 barrier layer.(C) 2010 American Institute of Physics. [doi:10.1063/1.3453659]
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