Nos tutelles

CNRS

Nos partenaires

Rechercher




Accueil > FR > Recherche > Dynamique non linéaire des Systèmes Optiques et Biologiques > Systèmes Optiques > Dynamique Non-linéaire des systèmes Optiques

NDOS home

par Eric LOUVERGNEAUX, Vincent ODENT - publié le , mis à jour le

Contact : eric.louvergneaux@univ-lille1.fr

NONLINEAR DYNAMICS of OPTICAL SYSTEMS
Home Members Publications Experimental lab and Skills Collaborations Theses and positions

The Nonlinear Dynamics of Optical Systems group is involved in the research and applications of nonlinear dynamical systems ranging from transverse pattern formation to temporal soliton instabilities. Our studies are theoretical as well as experimental and concern both fundamental and applied physics.

Research interests

  • Highly Nonlinear Regimes : Frequency Continuum and Rogue Waves
  • Dissipative Solitons and Localized Structures
  • Drifting Instabilities in Extended Systems
  • Noise Effects in Spatiotemporal Systems
  • Pattern Formation

Keywords

Pattern formation, hyghly nonlinear regimes, rogue waves, convective and absolute instabilities, noise-sustained structures, dissipative solitons, localized structures, noise effects, modulational instabilities, feedback, liquid crystals, Kerr medium, fibre ring resonator, extended systems, spatiotemporal dynamics, nonlinear optics.

Our nonlinear optical experimental lab

  • 2 single mode CW Verdi lasers @ 532 nm
  • Nonlinear media : homemade nematic liquid crystal slices (Kerr equivalent)

Projects

- "COLORS international project" of French Research National Agency (ANR).
- Coordination : E. Louvergneaux

COLORS : Control of Optical LOcalized and Rare Structures

In this project, we develop control methods and strategies for the optical localized structures arising in nonlinear passive optical experiments such as shaping the patterns, switching between different coexisting structures, displacing them transversally, or else controlling rare intense events (such as optical rogue waves) that can occur in spatiotemporal systems and that can have dramatic consequences.
We plan to study the statistics and properties of spatial localized intense events in different experimental configurations such as cavity and feedback systems. More specifically, we will explore their localization properties as well as the influence of the convective nature of the system in their statistical properties

Latest publications

Asymmetric counter propagation of domain walls, I. Andrade-Silva, M. G. Clerc, and V. Odent Communications in Nonlinear Science and Numerical Simulation 36, 192 (2016).

Asymmetric counterpropagating fronts without flow, I. Andrade-Silva, M. G. Clerc, and V. Odent, Physical Review E 91, 060501(R) (2015).

Out-of-equilibrium systems exhibit domain walls between different states. These walls, depending on the type of connected states, can display rich spatiotemporal dynamics. In this Rapid Communication, we investigate the asymmetrical counterpropagation of fronts in an in-plane-switching cell filled with a nematic liquid crystal. Experimentally,we characterize the different front shapes and propagation speeds. These fronts present dissimilar elastic deformations that are responsible for their asymmetric speeds. Theoretically, using a phenomenological model, we describe the observed dynamics with fair agreement.


Experimental observation of front propagation in a negatively diffractive inhomogeneous Kerr cavity, V. Odent, M. Tlidi, M. G. Clerc, P. Glorieux, and E. Louvergneaux, Physical Review A (Rapid Communications) 90, 011806R (2014).

A driven Fabry-Perot cavity with Kerr nonlinearity shows stable localized structures in a region far from modulational instability.

A focusing Kerr Fabry-Perot cavity operating in a negative diffraction regime exhibits transverse propagating fronts connecting two different nematic liquid crystal molecule average orientations. Under an inhomogeneous spatial pumping beam, these fronts stop to propagate and lead to the formation of a stable localized structure. The trajectory of the front position is derived from the mean-field model. Its hyperbolic tangent analytical expression perfectly fits the experimental data.


Contact : eric.louvergneaux@univ-lille1.fr