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Second harmonic generation applied to biomimetic interfaces

Defense Thèse de doctorat : Univ. Genève, 2018 - Sc. 5198 - 2018/03/29
Abstract Interface properties dramatically differ from those of the bulk phase. Specific techniques need to be used to study interfaces and, here, surface second harmonic generation was employed. This process is allowed at interfaces but not in the bulk. We have investigated biomimetic interfaces using Yellow Oxazole (YO) cyanine dyes and a dithienothiophene (DTT-1) push-pull molecule. YO compounds are well-known DNA probes and we showed that they could be used to study interfaces in the presence or not of DNA. DTT-1 was used as a mechanosensitive probe for detecting order and surface pressure at interfaces, extending its mechanism to nonlinear spectroscopy. Computer simulations were performed in parallel to the experiments in order to have a better microscopic view of the systems. The work presented in this thesis suggests that both classes of compound may be applied in the future as biological probes using second harmonic generation.
Keywords Second harmonic generationInterfacesCyanine dyeDithienothiopheneDNA probeMechanosensorBiological interfaceMolecular dynamicsAggregationExcitonic couplingSpectroscopyNonlinear optics
URN: urn:nbn:ch:unige-1037712
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Research group Groupe Vauthey
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LICARI, Giuseppe Léonardo. Second harmonic generation applied to biomimetic interfaces. Université de Genève. Thèse, 2018. doi: 10.13097/archive-ouverte/unige:103771 https://archive-ouverte.unige.ch/unige:103771

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Deposited on : 2018-04-23

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