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

Title
Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal
Authors
S. M. MorrisM. M. QasimK. T. ChengF. Castles고두현D. J. GardinerS. NosheenT. D. WilkinsonH. J. ColesC. BurgessL. Hill
Keywords
photo-tunable
Issue Date
2013-09
Publisher
Applied physics letters
Citation
VOL 103, NO 10, 101105-1-101105-5
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.
URI
http://pubs.kist.re.kr/handle/201004/46339
ISSN
00036951
Appears in Collections:
KIST Publication > Article
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