Ultraviolet-light-treated polyimide alignment layers for polarization-independent liquid crystal Fresnel lenses

S. J. Hwang, T. A. Chen, K. R. Lin, Shie-Chang Jeng*

*Corresponding author for this work

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

The surface energy of a conventional homeotropic polyimide (PI) alignment layer was altered via ultraviolet (UV) light irradiation, and the pretilt angle of the PI was changed along with the surface energy. The surface energy can be controlled by either UV exposure time or irradiation intensity. A switchable liquid crystal Fresnel lens (LCFL) was created by the UV-treated alignment layers to form a Fresnel zone-distribution hybrid alignment, vertically aligned and hybrid aligned LC in the odd and even zones, respectively. The LCFL was made polarization-independent by circular buffing, and it had a diffraction efficiency of ∼22% at a low driving voltage of ∼1.2 V.

Original languageEnglish
Pages (from-to)151-155
Number of pages5
JournalApplied Physics B: Lasers and Optics
Volume107
Issue number1
DOIs
StatePublished - 1 Apr 2012

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