Abstract
We present a flexoelectro-optic liquid crystal (LC) analog phase modulator with >2π phase range at a 1kHz switching frequency. The chiral nematic LC mixture consists of the bimesogen CBC7CB with chiral dopant R5011, aligned in the uniform lying helix mode. The mixture exhibits >±π/4 rotation of the optic axis for a drive voltage of ±21.5 V (E=±4.5 V μm-1). The rotation of the optic axis is converted into a phase modulation with the aid of a reflective device configuration incorporating a ∼5 μm LC cell, a polarizer, two quarter-wave plates, and a mirror. The residual amplitude modulation is found to be <23%. This flexoelectro-optic phase modulator combination has the potential to enable analog spatial light modulators with very fast frame rates suitable for a range of applications.
Highlights
We present a flexoelectro-optic liquid crystal (LC) analog phase modulator with >2π phase range at a 1 kHz switching frequency
Liquid crystal (LC) spatial light modulators (SLMs) are attractive components to perform this function because they can be relatively low in cost and offer high spatial resolution
An SLM that can simultaneously deliver 0–2π analog phase-only modulation and a fast frame rate would have the potential to enhance the performance of existing applications, as well as provide new opportunities
Summary
We present a flexoelectro-optic liquid crystal (LC) analog phase modulator with >2π phase range at a 1 kHz switching frequency. A chiral smectic ferroelectric LC device has shown a 1.96π phase range at 1 kHz but, with high nonlinearity, a steep transition with voltage and no information on amplitude modulation [7].
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