2024-03-29T14:08:18Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/58532022-11-17T02:08:08Zhdl_2115_20059hdl_2115_151Optical Sum-Frequency Emission from Langmuir-Blodgett Films of Variable Thickness : Effects of the Substrate and Polar Orientation of Fatty Acids in the FilmsNishida, TakumaJohnson, C. MagnusHolman, JasperOsawa, MasatoshiDavies, Paul B.Ye, Shen425The 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.American Physical SocietyJournal Articleapplication/pdfhttp://hdl.handle.net/2115/5853https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/5853/1/PRL96.pdf0031-9007Physical Review Letters960774022006-02-23enginfo:pmid/16606140info:doi/10.1103/PhysRevLett.96.077402Copyright © 2006 American Physical Societypublisher