58 research outputs found
Storage of localized structure matrixes in nematic liquid crystals
We show experimentally that large matrixes of localized structures can be
stored as elementary pixels in a nematic liquid crystal cell. Based on optical
feedback with phase modulated input beam, our system allows to store, erase and
actualize in parallel the localized structures in the matrix.Comment: 4 pages, 5 figure
Localized states in bistable pattern forming systems
We present an unifying description of a new class of localized states, appearing as large amplitude peaks nucleating over a pattern of lower amplitude. Localized states are pinned over a lattice spontaneously generated by the system itself. We show that the phenomenon is generic and requires only the coexistence of two spatially periodic states. At the onset of the spatial bifurcation, a forced amplitude equation is derived for the critical modes, which accounts for the appearance of localized peak
Reconciling and Validating the Ashworth-Davies Doppler Shifts of a Translating Mirror
We simplify the Ashworth-Davies special relativistic theory of a uniformly
translating mirror with an arbitrary angle of incidence and direction of
propagation in the non-relativistic limit. We show that it is in good agreement
with a more intuitive derivation that only considers the constancy of the speed
of light. We confirm the theory with phase-insensitive frequency measurements
using a liquid crystal light valve
Characterization of the vortex-pair interaction law and nonlinear mobility effects
Employing nematic liquid crystals in a homeotropic cell with a photosensitive wall, dissipative vortex pairs are selectively induced by external illumination and the interaction law is characterized for pairs of opposite topological charges. Contrary to the phenomenological fit with a force inversely proportional to the distance, the data provide evidence that nonlinear mobility effects must be taken into account. The observations lead to a reconciliation of experiments with theory
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