WELLS, G.G., 2009. Voltage programmable liquid optical devices. PhD, Nottingham Trent University.
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In this study I have looked at two types of voltage programmable liquid optical device. The first is a rotatable liquid crystal waveplate and the second is an amplitude programmable liquid phase grating. The rotatable waveplate was created by confining a droplet of E7 nematic liquid crystal between two glass substrates in a photolithographically produced square well of 60x60x15µm dimensions. The droplet forms a circular disc shape with two nematic defects at opposite edges of the disc. The optical texture has been examined and the most likely n-director orientation is shown to be Bipolar. Electrodes etched into the sandwiching substrate allow an in-plane electric field to be applied and because of the E7's positive dielectric anisotropy the n-director of the droplet aligns itself with the field. The speed at which this rotation occurs is shown to follow the relationship Ø = 0.0472гV 2 and rotation speeds of 450° /s have been achieved.
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|Divisions:||Schools > School of Science and Technology|
|Depositing User:||EPrints Services|
|Date Added:||09 Oct 2015 09:34|
|Last Modified:||09 Oct 2015 09:34|
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