Abstract
Absorption spectra and second-harmonic generation of Langmuir–Blodgett monolayers containing a hemicyanine dye with a large second-order hyperpolarizability are reported. The dye is found to be in the form of H aggregates in a pure-dye film and mostly monomeric in a 1:4 dye–arachidic acid film. This observation explains a report in the literature that mixed dye–arachidic acid films display greater second-harmonic generation efficiency than a pure-dye film. It may also be a factor in the reported failure of second-harmonic generation to increase quadratically with the number of layers in noncentrosymmetric multilayer films.
Original language | English (US) |
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Pages (from-to) | 134-136 |
Number of pages | 3 |
Journal | Optics Letters |
Volume | 13 |
Issue number | 2 |
DOIs | |
State | Published - Feb 1988 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics