Patterns, fronts and structures in a Liquid-Crystal-Light-Valve with optical feedback

摘要: Abstract The basic mechanisms of optical pattern formation are reviewed, with particular reference to a system based on Liquid-Crystal-Light-Valve feedback. is described in different configurations, corresponding the experiments that have led most fascinating observations, such as crystals and quasi-crystals, geometrical frustration leading domain coexistence competition, super-lattices characterized by couplings wave vectors at lengths orientations. purely diffractive interferential cases discussed separately, way outline main features two types feedback give better understanding complex behaviors observed when both simultaneously present. role nonlocality loop, rotation or drift, put into evidence, showing how this parameter drives symmetry selection pattern-forming process. linear stability analysis for given relevant analytical results, whereas nonlinear behavior dynamics experimental findings. In particular, one-dimensional reported, which allow direct comparison models secondary instabilities patterns. For case, it shown patterns undergo destabilization process dissipative generalization classical three-wave interaction optics. an transition spatio-temporal chaos reported. Finally, more fundamental approach liquid crystal physics presented, Freedericksz becomes first-order one presence light-driven regime, instead there fronts connecting metastable states. When bistability coexists formation, due feedback, stable localized structures can be excited system, either form isolated bound Highly ordered clusters may also obtained choosing close recurrence angle. Recent results radial azimuthal motion along concentric rings, selected