Morris, S. M. Qasim, M. M. Cheng, K. T. Castles, F. Ko, D-H. Gardiner, D. J. Nosheen, S. Wilkinson, T. D. Coles, H. J. Burgess, C. Hill, L. 2024-01-20T11:32:49Z 2024-01-20T11:32:49Z 2021-09-05 2013-09-02 0003-6951 https://pubs.kist.re.kr/handle/201004/127673 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 photoactive 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. (C) 2013 AIP Publishing LLC. English AMER INST PHYSICS LIGHT SHUTTERS COLOR-CHANGE DOPANTS REFLECTION SWITCHES BANDGAPS FILTER Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal Article 10.1063/1.4818679 1 APPLIED PHYSICS LETTERS, v.103, no.10 APPLIED PHYSICS LETTERS 103 10 scie scopus 000324389700005 2-s2.0-84884228721 Physics, Applied Physics Article LIGHT SHUTTERS COLOR-CHANGE DOPANTS REFLECTION SWITCHES BANDGAPS FILTER photo-tunable