OPTICAL PROPERTIES OF MULTILAYER PHOTON STRUCTURES CONTAINING TWISTED NEMATIC COMPONENTS

Gunyakov, V. A.; Timofeev, I., V; Sutormin, V. S.; Krakhalev, M. N.; Parshin, A. M.; et al. // Liquid Crystals And Their Application//

https://doi.org/10.1016/j.optmat.2019.109630

Optical modes of a multilayered photonic structure with the twisted nematic liquid crystal as a defect layer have been investigated. The electroconvective flow in the nematic makes a spatially periodic structure in the form of abnormal rolls. Non-adiabatic propagation of polarized light in the defect layer causes unique features of the optical modes corresponding to the ordinary $o$ -waves. The decay of these modes has been demonstrated with increasing voltage due to the effect of cross-polarization diffraction loss. The modes short-wave shift resulting from the contribution of the non-adiabatic geometric phase to the total phase delay of the wave during a round-trip propagation through the photonic structure has been found both experimentally and numerically.