Switchable Polarisation-Independent Blue Phase Liquid Crystal Fresnel Lens Based On Phase-Separated Composite Films

Keywords

Blue phase liquid crystal; diffraction; Fresnel lens; photo polymerisation-induced phase separation

Abstract

A simple method for fabricating a polarisation independent blue-phase liquid crystal Fresnel lens (BPLCFL) is demonstrated by utilising the photo-polymerisation-induced phase separation. The BPLC/polymer binary Fresnel zones is obtained well by periodic UV illumination with phase separation of the BPLC molecules and UV-curable pre-polymer mixture. The diffraction efficiency can be controlled when applying a uniform electric field which modulates the phase difference between even and odd Fresnel zones. Experimental results show that the maximum diffraction efficiency reaches 24.3%, which is close to the measured diffraction efficiency of the used Fresnel zone-plate mask of 25%. We also characterise the tunable lens performance at different applied voltages.

Publication Date

5-28-2017

Publication Title

Liquid Crystals

Volume

44

Issue

7

Number of Pages

1078-1085

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/02678292.2016.1262070

Socpus ID

84999673403 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84999673403

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