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Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal

Morris, SM and Qasim, MM and Cheng, KT and Castles, F and Ko, D-H and Gardiner, DJ and Nosheen, S and Wilkinson, TD and Coles, HJ and Burgess, C and Hill, L (2013) Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal. Applied Physics Letters, 103. ISSN 0003-6951

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Abstract

We report the demonstration of an optically activated shutter based upon a short-pitch chiral nematic liquid crystal (LC) device sandwiched between crossed polarizers. This LC is comprised of photo-active chiral dopants. In the trans-state, the LC appears dark between crossed polarizers due to the very short pitch. As the pitch is extended through exposure to ultraviolet light, the device becomes transmissive reaching a maximum for a particular value of the pitch. As a result, it is possible to switch between the light and dark states by subjecting the device to visible light so as to cause a cis-trans photo-isomerisation. © 2013 AIP Publishing LLC.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div B > Photonics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:45
Last Modified: 08 Dec 2014 02:17
DOI: 10.1063/1.4818679