Highest observed second harmonic intensity from a multilayered Langmuir-Blodgett film structure

1 March 1991

proceedings article
Published by SPIE-Intl Soc Optical Eng

p. 589-598
https://doi.org/10.1117/12.24423

Abstract

Strong second harmonic generation (SHG) has been obtained from multilayered LangmuirBlodgett (LB) films of (i) a new hemicyanine dye ENoctadecyl--4-''(4-diirtethylaminophenyl) ethenyl)pyridinium iodide interleaved with 4 4 ''dioctadecyl--3 5 3 '' 5 '' -tetramethyldipyrrylmethene hydrobrornide and (ii) an unusual irbridged donor-acceptor zwitterion Z/3(Nhexadecyl4quinolinium) acyano4styryldicyanomethanide . The SH intensity increases quadratically with the number of LB layers. For the interleaved structure the SH intensity obtained from 200 layers (Ca. 0. 5 m thick) is 18 times the signal from a monolayer of the hemicyanine dye reported by Girling et al the intensity is the highest reported for an LB film.

Keywords

SECOND-HARMONIC GENERATION

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