Title

Tunable-Focus Liquid Crystal Lens With Non-Planar Electrodes

Keywords

Gradient index lens; non-planar electrode; tunable liquid crystal lens

Abstract

We study a tunable-focus lens with convex and flat electrodes in a homogeneous liquid crystal (LC) cell. In a voltage-on state, a centro-symmetric gradient refractive index is generated within the LC layer, which causes the focusing behavior for the extraordinary wave. There have been experimental studies of the systems with spherical or parabolic shape of the top electrodes and there is a need in the theoretical modeling. We present a theoretical model of the lens with spherical top electrode and analyze its properties. We solve the Maxwell equations that are coupled to the Euler-Lagrange equations from the variational principle applied to the total free energy minimization. LC director spatial profile is found subject to the applied voltage. After that the phase retardation profile of the test light beam is calculated and thus a focal length dependence on the applied field. The simulation results agree well with experimental data. This LC lens has advantages in relatively large focal length range and low operating voltage. Copyright © Taylor & Francis Group, LLC.

Publication Date

8-30-2010

Publication Title

Molecular Crystals and Liquid Crystals

Volume

526

Number of Pages

93-100

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1080/15421406.2010.485105

Socpus ID

77955961459 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/77955961459

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