Tunable Nematic Liquid Crystal PS-NPS Lens

This work introduces a tunable nematic liquid crystal Photon Sieve-Negative Photon Sieve lens based on UV-curable polymer. The LC molecules that aligned in the different zones of the NPS-PSlens makes a refractive index difference. The fabricated lens can deform from PS to NPS mode and reverse in two various linear polarisations. The maximum focus efficiency that reached (∼38.5%) for the PS lens mode and (∼22%) for NPS lens mode that measured by applying a suitable AC voltage which was close to the maximum theoretical diffraction efficiency (∼40.5%). Electrically tunable diffraction efficiency, focal points variations and, a dual lens like mode were the features of our designed optical device.