Patterns and optical structures in liquid-crystal light-valve experiments
Seminar Room 1, Newton Institute
I will review the basic mechanisms of optical pattern formation, with particular reference to Liquid-Crystal-Light-Valve (LCLV) experiments, where patterns and quasi-patterns have been observed for different settings in the optical feedback loop. I will show dynamical competition between different patterns (hexagons-stripes) and bistability between different states, either homogeneous or spatially periodic. In the bistable regimes, stable localized structures can be excited, that have features of addressable single elements. When bistability is between patterns, a new class of localized structures appear, that are localized peaks of one pattern nucleating over the other pattern state.