Z-type films for second harmonic generation
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United States of America Patent
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Jul 28, 1998
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N/A
app pub date -
Jan 29, 1996
filing date -
Aug 11, 1993
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Expired
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Abstract
Optically non-linear materials suitable upon repeated Langmuir-Blodgett dipping for forming Z-type (head-to-tail) films for second harmonic generation include hemicyanine dyes which are very unsymmetrical, i.e. which have hydrophobic substituents differing in size by at least 4 carbon atoms, each end of a hydrophilic chromophore. A suitable dye is E-N-octadecyl-4-?2-(4-dibutylaminophenyl)ethenyl!quinolinium iodide.
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