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• W3080462426 startingPage "3761" @default.
• W3080462426 abstract "It is known that the liquid crystalline smectic-A phase has geometric defects, called focal conic domains, which can be used as gradient-index microlenses. Cholesteric (chiral nematic) phases also have topological defects with a central symmetry and a singularity at their center. We explore a weakly chiral system in which both types of defects can be present in the same material at different temperatures, and with this strategy we create lenses whose focal length is tunable with temperature. We measure the focal length of the tunable lenses, and we investigate the behavior of the defects near the phase transition. We identify the experimental conditions that make the simultaneous presence of the smectic focal conic domains and the circular cholesteric domains possible, such as the concentration of chiral dopant and the rate of heating and cooling. The transformation of focal conic domains into circular cholesteric domains is a new example of memory at the phase transition between smectic-A and nematic liquid crystals." @default.
• W3080462426 created "2020-09-01" @default.
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• W3080462426 date "2020-08-26" @default.
• W3080462426 modified "2023-10-06" @default.
• W3080462426 title "Chiral Liquid Crystal Lenses Confined in Microchannels" @default.
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• W3080462426 doi "https://doi.org/10.3390/ma13173761" @default.
• W3080462426 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7503803" @default.
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• W3080462426 hasPublicationYear "2020" @default.
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