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Optical sum-frequency emission from Langmuir-Blodgett films of variable thickness: Effects of the substrate and polar orientation of fatty acids in the films
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Corrosion Science.
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2006 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, no 7Article in journal (Refereed) Published
Abstract [en]

The nonlinear optical response arising from a model multilayer structure, i.e., Langmuir-Blodgett (LB) films comprised of different numbers of per-protonated (H) and per-deuterated (D) fatty acid layers on solid substrates, has been evaluated by sum-frequency generation (SFG) spectroscopy. The SFG signals depend significantly on the absolute polar orientation of the fatty acids in the individual layers and on the nonlinear optical response of the substrate. The SFG spectra on gold and fused quartz substrates demonstrate a totally different dependence on the number of the contributing H layers, which it is possible to analyze quantitatively. The results provide important information for understanding the origin of the nonlinear optical responses from ordered systems composed of multiple interfaces and therefore for extracting exact structural information about each interface from the observed SFG signals.

Place, publisher, year, edition, pages
2006. Vol. 96, no 7
Keyword [en]
generation vibrational spectroscopy, stearic-acid, structural-changes, multilayer films, surface, reflectivity, neutron
Identifiers
URN: urn:nbn:se:kth:diva-15451DOI: 10.1103/PhysRevLett.96.077402ISI: 000235554100079OAI: oai:DiVA.org:kth-15451DiVA: diva2:333492
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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