Electrically switchable liquid crystal fresnel lens using UV-modified alignment film

Shie-Chang Jeng, Shug June Hwang*, Jing Shyang Horng, Kuo Ren Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

A simple method to make a switchable liquid crystal (LC) Fresnel lens with high diffraction efficiency and a low driving voltage was proposed based on the photo-induced surface modification of the vertical alignment layer. UV illumination alters the pretilt angle of alignment layers, a Fresnel zone-distribution hybrid alignment in the homeotropic LC cell can be straightforwardly achieved through UV exposure, yielding a concentric structure of the Fresnel phase LC lens. A remarkable diffraction efficiency of ∼31.4%, close to the measured diffraction efficiency of the used Fresnel-zone-plate mask of 32%, was detected using a linearly polarized incident beam.

Original languageEnglish
Pages (from-to)26325-26331
Number of pages7
JournalOptics Express
Volume18
Issue number25
DOIs
StatePublished - 6 Dec 2010

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