Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal
- Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal
- S. M. Morris; M. M. Qasim; K. T. Cheng; F. Castles; 고두현; D. J. Gardiner; S. Nosheen; T. D. Wilkinson; H. J. Coles; C. Burgess; L. Hill
- Issue Date
- Applied physics letters
- VOL 103, NO 10, 101105-1-101105-5
- 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.
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