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

S. M. Morris; M. M. Qasim; K. T. Cheng; F. Castles; D. H. Ko; D. J. Gardiner; S. Nosheen; T. D. Wilkinson; H. J. Coles; C. Burgess; L. Hill

doi:10.1063/1.4818679

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

S. M. Morris, M. M. Qasim, K. T. Cheng, F. Castles, D. H. Ko, D. J. Gardiner, S. Nosheen, T. D. Wilkinson, H. J. Coles, C. Burgess, L. Hill

Department of Optics and Photonics

Research output: Contribution to journal › Article › peer-review

25 Scopus citations

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.

Original language	English
Article number	101105
Journal	Applied Physics Letters
Volume	103
Issue number	10
DOIs	https://doi.org/10.1063/1.4818679
State	Published - 2 Sep 2013

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title = "Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal",

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.",

author = "Morris, {S. M.} and Qasim, {M. M.} and Cheng, {K. T.} and F. Castles and Ko, {D. H.} and Gardiner, {D. J.} and S. Nosheen and Wilkinson, {T. D.} and Coles, {H. J.} and C. Burgess and L. Hill",

note = "Funding Information: One of the authors (SMM) gratefully acknowledges The Royal Society for financial support. D.-H. Ko acknowledges support from a grant of 2E23892 from KIST project.",

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T1 - Optically activated shutter using a photo-tunable short-pitch chiral nematic liquid crystal

AU - Morris, S. M.

AU - Qasim, M. M.

AU - Cheng, K. T.

AU - Castles, F.

AU - Ko, D. H.

AU - Gardiner, D. J.

AU - Nosheen, S.

AU - Wilkinson, T. D.

AU - Coles, H. J.

AU - Burgess, C.

AU - Hill, L.

N1 - Funding Information: One of the authors (SMM) gratefully acknowledges The Royal Society for financial support. D.-H. Ko acknowledges support from a grant of 2E23892 from KIST project.

PY - 2013/9/2

Y1 - 2013/9/2

N2 - 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.

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

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