Articles dans des revues à comité de lecture
|Structure of the dielectric tensor in nematic liquid crystals with topological charge|
|Vaveliuk P., Moraes F., Fumeron S., Martinez Matos O., Calvo M.L.|
|JOSA A 27 (2010) 1466|
|DOI : 10.1364/JOSAA.27.001466|
A q-plate is a stratified medium composed of a uniaxial nematic liquid crystal with an inhomogeneous orientation of the optical axis possessing a topological charge q, which looks promising as a switching device. This work reports an approach to diagonalizing the dielectric tensor in q-plates, giving a detailed study of nontrivial tensor coordinate transformations. The relationship between the diagonal dielectric tensor and the topological charge of the plate is established. From that, the dielectric tensor for a given q-plate can be explicitly calculated in a convenient frame, and hence the field propagation equations can be derived. These studies establish a theoretical basis that could further deepen the research on these particular structures for nonconventional manipulation of the light.