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Proceedings Paper

Integrated organic donor-acceptor bulk heterojunctions for self-activated liquid crystal light modulators.
Author(s): Thomas Regrettier; Malgosia Kaczmarek; Giampaolo D'Alessandro; Thomas Heiser
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Paper Abstract

Optically addressed spatial light modulators (OASLM) are promising for holographic applications and optical limiters. Self-activated OASLMs can operate as autonomous energy devices, opening the route to stand-alone laser protection devices and smart windows. They are mainly based on liquid crystal (LC) devices, integrated with inorganic photovoltaic substrates such as LiNbO3:Fe or dye-sensitized TiO2. While robust, they also suffer from several restrictions such as high costs, low performances and/or small device area.

In this work, we propose a new type of an autonomous modulator. Blends of electron-donating (D) conjugated polymers and electron-accepting (A) fullerene molecules were used as a photovoltaic thin films and integrated into liquid crystal device. Such D/A bulk heterojunctions are the major building block of solution-processed organic solar cells and are known to convert incident light into electrical energy. In our case, the organic layer generates a photovoltaic field that is used to control the LC alignment under illumination. We carried out cross-polarized intensity measurements on this photovoltaic-LC device to demonstrate the expected occurrence of a light–dependent birefringence change, without an applied voltage. In this way, by combining solution-processed organic photovoltaic thin films with optical responsive liquid crystals, our work paves the way to low cost and large area self-sustained optical devices.

Paper Details

Date Published: 14 September 2018
PDF: 7 pages
Proc. SPIE 10735, Liquid Crystals XXII, 1073514 (14 September 2018); doi: 10.1117/12.2320692
Show Author Affiliations
Thomas Regrettier, Lab. ICube Univ. de Strasbourg, CNRS (France)
Malgosia Kaczmarek, Univ. of Southampton (United Kingdom)
Giampaolo D'Alessandro, Univ. of Southampton (United Kingdom)
Thomas Heiser, Lab. ICube, Univ. de Strasbourg, CNRS (France)

Published in SPIE Proceedings Vol. 10735:
Liquid Crystals XXII
Iam Choon Khoo, Editor(s)

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