Skip to Main content Skip to Navigation
Theses

Effets du bruit et d'un flot transverse sur les instabilités spatio-temporelles dans un système optique à cristaux liquides

Abstract : Spontaneous pattern formation has attracted interest in many different scientific domains, as it is a widespread phenomenon manifested, for instance, in sand ripples, cloud stripes and leopard's skin. This work is a contribution to the study of these phenomena in the field of optics. It combines theoretical, numerical and experimental study, and focuses onto a liquid crystal system with optical feedback. First, non-trivial effects of noise on the pattern formation are studied. For instance, we show the presence of noise-induced precursors that anticipate some properties of the patterns appearing above the threshold. Second, we evidence that a transversal drift leads to the existence of a new instability (convective) leading to new noise-sustained structures. Their properties, their domains of existence as well as their combinations are studied.
Document type :
Theses
Complete list of metadatas

Cited literature [115 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-00010207
Contributor : Gonzague Agez <>
Submitted on : Monday, September 19, 2005 - 8:15:16 PM
Last modification on : Wednesday, October 21, 2020 - 3:41:39 AM
Long-term archiving on: : Friday, September 14, 2012 - 2:35:39 PM

Identifiers

  • HAL Id : tel-00010207, version 1

Collections

Citation

Gonzague Agez. Effets du bruit et d'un flot transverse sur les instabilités spatio-temporelles dans un système optique à cristaux liquides. Physique [physics]. Université des Sciences et Technologie de Lille - Lille I, 2005. Français. ⟨tel-00010207⟩

Share

Metrics

Record views

213

Files downloads

671