Wide area mapping of liquid crystal devices with passive and active command layers

Thomas Bennett; Matthew Proctor; Jon Forster; Eleni Perivolari; Nina Podoliak; Matthew Sugden; Roger Kirke; Thomas Regrettier; Thomas Heiser; Malgosia Kaczmarek; Giampaolo D’Alessandro

doi:10.1364/AO.56.009050

Applied Optics
Vol. 56,
Issue 32,
pp. 9050-9056
(2017)
•https://doi.org/10.1364/AO.56.009050

Wide area mapping of liquid crystal devices with passive and active command layers

Thomas Bennett, Matthew Proctor, Jon Forster, Eleni Perivolari, Nina Podoliak, Matthew Sugden, Roger Kirke, Thomas Regrettier, Thomas Heiser, Malgosia Kaczmarek, and Giampaolo D’Alessandro

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Thomas Bennett, Matthew Proctor, Jon Forster, Eleni Perivolari, Nina Podoliak, Matthew Sugden, Roger Kirke, Thomas Regrettier, Thomas Heiser, Malgosia Kaczmarek, and Giampaolo D’Alessandro, "Wide area mapping of liquid crystal devices with passive and active command layers," Appl. Opt. 56, 9050-9056 (2017)

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Abstract

We track the non-uniformity of a wide area liquid crystal device using multiple cross-polarized intensity measurements. They give us not only accurate estimates of the core physical liquid crystal parameters, such as elastic constants, but also spatial maps of the device properties, including the liquid crystal thickness and pretilt angle. A bootstrapping statistical analysis, coupled with the multiple measurements, gives us reliable error bars on all the measured parameters.

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Equations (9)

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$N_{s}$	${\hat{K}}_{1}$	${\hat{K}}_{3}$
2	$10.70 \pm 0.016$	$16.20 \pm 0.023$
6	$10.70 \pm 0.020$	$16.20 \pm 0.037$
12	$10.66 \pm 0.022$	$16.23 \pm 0.036$
24	$10.64 \pm 0.017$	$16.25 \pm 0.028$

LC	Cell type	$K_{1}$ [pN]	$K_{3}$ [pN]
E7	PI	$10.7 \pm 0.02$	$16.2 \pm 0.03$
E7	P3HT	$10.9 \pm 0.04$	$18.0 \pm 0.07$
TL205	PI	$17.0 \pm 0.05$	$23.0 \pm 0.16$

Reference	$K_{1}$ [pN]	$K_{3}$ [pN]
Raynes et al. (1979) [27]	11.7	19.5
Raynes et al. (2003) [21]	11.2	18.6
Trabi et al. (2008) [28]	10.5	15.2
Chen et al. (2015) [29]	10.8	17.5

$N_{s}$	${\hat{K}}_{1}$	${\hat{K}}_{3}$
2	$10.70 \pm 0.016$	$16.20 \pm 0.023$
6	$10.70 \pm 0.020$	$16.20 \pm 0.037$
12	$10.66 \pm 0.022$	$16.23 \pm 0.036$
24	$10.64 \pm 0.017$	$16.25 \pm 0.028$

LC	Cell type	$K_{1}$ [pN]	$K_{3}$ [pN]
E7	PI	$10.7 \pm 0.02$	$16.2 \pm 0.03$
E7	P3HT	$10.9 \pm 0.04$	$18.0 \pm 0.07$
TL205	PI	$17.0 \pm 0.05$	$23.0 \pm 0.16$

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Equations (9)

Applied Optics