Analysis of polarisation change in an electric field-driven liquid crystal lens of cylindrical type where lc are aligned twisted

Electric field-driven liquid crystals (ELC) use the non-uniform distribution of LC directors and show strong dependence on the polarisation direction of the incident light. Phase changes by an ELC lens where LC directors are twisted are investigated.When the polarisation direction of incident light is parallel to the rubbing of the LC cell of the ELC lens on the side of the incident light, the polarisation direction of the propagating light follows the twist of the LC directors. Hence, outgoing light is still linearly polarised and its phase profile can be controlled to match that of a geometric cylindrical lens.