Abstract
AbstractAlignment of benzaldehyde materials with different photosensitivity thresholds, capable of changing the pretilt angles of nematic liquid crystal (LC) from 90° to 0° in a controlled manner under UV‐B exposure, has been developed. Inhomogeneous exposure of uniform rubbed alignment layers allows the formation of a refractive index gradient inside the LC cell. The concept of tunable polarization‐independent self‐aligned LC lens based on gradient pretilt angle alignment materials with different photosensitivity is demonstrated. Self‐alignment of two polarization‐dependent sub‐lens is achieved due to a single exposure act of two alignment layers, which are located on the same piece of glass on both sides, forming one common optical axis for a polarization‐independent LC lens. The sub‐lens cells have uniform cell gap and are independently controlled using low‐voltage driving. Devices based on gradient benzaldehyde alignment materials can be used in many modern optical and photonic devices.
Highlights
The alignment material for liquid crystal (LC) with the ability to set the pretilt angle gradient allows the implementation of various passive or active LC devices and optical elements such as diffraction gratings, lenses, waveguides, and others.[1]
We investigated LC director inclination on the gradient pretilt angle alignment materials (GPAAM) comprising 40%mol (GPAAM1) and 25%mol (GPAAM2) of vertical alignment groups in the course of UV irradiation of alignment layers
Self-aligned polarization-independent LC lens based on GPAAM with different photosensitivity consists of three substrates arranged in the form of a sandwich
Summary
The alignment material for liquid crystal (LC) with the ability to set the pretilt angle gradient allows the implementation of various passive or active LC devices and optical elements such as diffraction gratings, lenses, waveguides, and others.[1]. KEYWORDS gradient alignment materials, polarization-independent LC lens 1 | INTRODUCTION All these requirements are fulfilled via the application of gradient alignment layers for the creation of tunable LC lenses,[6,11,12] based on photosensitive alignment materials with the following properties:
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