| Autor: |
Wijekoon, W. M. K. P., Karna, S. P., Talapatra, G. B., Prasad, P. N. |
| Zdroj: |
Journal of the Optical Society of America B: Optical Physics; February 1993, Vol. 10 Issue: 2 p213-221, 9p |
| Abstrakt: |
Second-harmonic generation (SHG) studies have been carried out on Langmuir-Blodgett films of 2-docosyl-amino-5-nitropyridine that were transferred by two different dipping techniques: vertical y-type and horizontal x-type depositions. The SHG behavior of horizontally transferred films is remarkably different from that of the vertically transferred films. In y-type films the SHG is due mainly to the in-plane component χ^(2)_yyy (which is along the dipping axis) of the second-order nonlinear optical susceptibility tensor and χ^(2)_xxx is negligible. In the case of x-type films, the SHG is due to the in-plane χ^(2) tensor components but χ^(2)_yyy and χ^(2)_xxx have comparable magnitudes. In both films the nonlinear optical chromophores lie almost flat with respect to the plane of the substrate. The cancellation of χ^(2)_xxx in y-type films is due to the preferential orientation of molecular domains along the dipping axis. In horizontally transferred films, molecular domains seem to be randomly distributed on the surface. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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