4.4 Article

Transmissive flexoelectro-optic liquid crystal optical phase modulator with 2π modulation

Journal

AIP ADVANCES
Volume 10, Issue 5, Pages -

Publisher

AMER INST PHYSICS
DOI: 10.1063/5.0009630

Keywords

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Funding

  1. Engineering and Physical Sciences Research Council (UK) [EP/M017923/1, EP/M015726/1, EP/M016218/1]
  2. European Space Agency [4000125232/18/NL/AR/zk]
  3. Punjab Educational Endowment Fund (Pakistan)
  4. Vicky Noon Education Foundation
  5. EPSRC [EP/M017923/1, EP/M015726/1, EP/M016218/1] Funding Source: UKRI

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In this paper, we demonstrate analog phase modulation in a transmissive configuration using the flexoelectro-optic effect in short-pitch chiral nematic liquid crystal (LC) devices. Two different modes are considered, both of which are shown to generate full 2 pi phase modulation at 1 kHz switching frequency. The first configuration that is considered consists of a half-wave plate that is placed between two flexoelectro-optic LC devices that are subjected to electric fields that are applied in phase. Second, we demonstrate that a similar phase modulation response can be observed by removing the half-wave plate and subjecting the two flexoelectro-optic LC devices to electric fields whereby the polarities are out of phase. Both configurations demonstrated herein are promising for the development of next-generation LC spatial light modulators, particularly when reflective geometries are challenging or impractical.

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