Optically guided mode study of nematic liquid crystal alignment on a zero-order grating

DSpace/Manakin Repository

Open Research Exeter (ORE)

Optically guided mode study of nematic liquid crystal alignment on a zero-order grating

Show simple item record

dc.contributor.author Hallam, B. T. en_GB
dc.contributor.author Sambles, J. Roy en_GB
dc.contributor.department University of Exeter en_GB
dc.date.accessioned 2008-07-14T15:10:19Z en_GB
dc.date.accessioned 2011-01-25T11:55:12Z en_US
dc.date.accessioned 2013-03-20T13:23:46Z
dc.date.issued 2000 en_GB
dc.description.abstract The characterization of a liquid crystal cell, which comprises one zero-order (that is, at the wavelength of study it is nondiffractive) diffraction grating and one rubbed polyimide-coated substrate, has been performed using an optically guided mode technique. The cell is filled with nematic liquid crystal E7 (manufactured and sold by Merck, Poole, U.K.). The excitation of fully leaky guided modes within the liquid crystal layer has allowed the optical director profile to be quantified under the application of weak in-plane electric fields. The fitting of angle-dependent optical data to multilayer optical theory yields the accurate twist profile of the liquid crystal for different field strengths. Comparisons with profiles predicted from elastic continuum theory, assuming a Rapini-Papoular-type anchoring at the surfaces, allow both the azimuthal anchoring strength at each surface and the twist elastic constant of the bulk to be accurately determined. Repeating these measurements as a function of temperature allows the surface and bulk order parameters of the grating-aligned liquid crystal to be deduced. en_GB
dc.identifier.citation 61 (6), pp. 6699-6704 en_GB
dc.identifier.doi 10.1103/PhysRevE.61.6699 en_GB
dc.identifier.uri http://hdl.handle.net/10036/31952 en_GB
dc.language.iso en en_GB
dc.publisher American Physical Society en_GB
dc.relation.url http://dx.doi.org/10.1103/PhysRevE.61.6699 en_GB
dc.relation.url http://link.aps.org/abstract/PRE/v61/p6699 en_GB
dc.title Optically guided mode study of nematic liquid crystal alignment on a zero-order grating en_GB
dc.type Article en_GB
dc.date.available 2008-07-14T15:10:19Z en_GB
dc.date.available 2011-01-25T11:55:12Z en_US
dc.date.available 2013-03-20T13:23:46Z
dc.identifier.issn 1539-3755 en_GB
dc.identifier.issn 1550-2376 en_GB
dc.description B. T. Hallam and J. Roy Sambles, Physical Review E, Vol. 61, pp. 6699-6704 (2000). "Copyright © 2000 by the American Physical Society." en_GB
dc.identifier.journal Physical Review E en_GB


Files in this item

Files Size Format View
Optically guided.pdf 280.0Kb PDF Thumbnail

This item appears in the following Collection(s)

Show simple item record

Browse

My Account

Local Links