Doctoral thesis
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Second harmonic generation applied to biomimetic interfaces

DirectorsVauthey, Ericorcid
Defense date2018-03-29
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 generation
  • Interfaces
  • Cyanine dye
  • Dithienothiophene
  • DNA probe
  • Mechanosensor
  • Biological interface
  • Molecular dynamics
  • Aggregation
  • Excitonic coupling
  • Spectroscopy
  • Nonlinear optics
Research groups
Citation (ISO format)
LICARI, Giuseppe Léonardo. Second harmonic generation applied to biomimetic interfaces. Doctoral Thesis, 2018. doi: 10.13097/archive-ouverte/unige:103771
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Creation20/04/2018 12:57:00
First validation20/04/2018 12:57:00
Update time15/03/2023 09:08:58
Status update15/03/2023 09:08:57
Last indexation31/10/2024 11:06:32
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