Voltage programmable liquid optical devices

WELLS, G.G., 2009. Voltage programmable liquid optical devices. PhD, Nottingham Trent University.

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Abstract

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.

Item Type: Thesis
Creators: Wells, G.G.
Date: 2009
Rights: This work is the intellectual property of the author, and may also be owned by the research sponsor(s) and/or Nottingham Trent University. You may copy up to 5% of this work for private study, or personal, non-commercial research. Any re-use of the information contained within this document should be fully referenced, quoting the author, title, university, degree level and pagination. Queries or requests for any other use, or if a more substantial copy is required, should be directed in the first instance to the author.
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
URI: http://irep.ntu.ac.uk/id/eprint/168

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