Nematic twist cell: Strong chirality induced at the surfaces
TC Lin, IR Nemitz, JS Pendery, CPJ Schubert… - Applied Physics …, 2013 - pubs.aip.org
A nematic twist cell having a thickness gradient was filled with a mixture containing a
configurationally achiral liquid crystal (LC) and chiral dopant. A chiral-based linear
electrooptic effect was observed on application of an ac electric field. This “electroclinic
effect” varied monotonically with d, changing sign at d= d 0 where the chiral dopant exactly
compensated the imposed twist. The results indicate that a significant chiral electrooptic
effect always exists near the surfaces of a twist cell containing molecules that can be …
configurationally achiral liquid crystal (LC) and chiral dopant. A chiral-based linear
electrooptic effect was observed on application of an ac electric field. This “electroclinic
effect” varied monotonically with d, changing sign at d= d 0 where the chiral dopant exactly
compensated the imposed twist. The results indicate that a significant chiral electrooptic
effect always exists near the surfaces of a twist cell containing molecules that can be …
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