Electrically switchable and optically rewritable reflective Fresnel zone plate in dye-doped cholesteric liquid crystals

Ko Ting Cheng, Cheng Kai Liu, Chi Lun Ting, Andy Ying Guey Fuh

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

This work demonstrates a reflective Fresnel zone plate based on dye-doped cholesteric liquid crystals (DDCLC) using the photo-induced realignment technique. Illumination of a DDCLC film with a laser beam through a Fresnel-zone-plate mask yields a reflective lens with binaryamplitude structures - planar and focal conic textures, which reflect and scatter probed light, respectively. The formed lens persists without any external disturbance, and its focusing efficiency, analyzed using circularly polarized light, is ∼ 23.7%, which almost equals the measured diffraction efficiency of the used Fresnel-zone-plate mask (&sim. 25.6%). The lens is thermally erasable, rewritable and switchable between focusing and defocusing states, upon application of a voltage.

Original languageEnglish
Pages (from-to)14078-14085
Number of pages8
JournalOptics Express
Volume15
Issue number21
DOIs
StatePublished - 17 Oct 2007

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