Show simple item record

dc.contributor.authorHallam, B. T.en_GB
dc.contributor.authorSambles, J. Royen_GB
dc.contributor.departmentUniversity of Exeteren_GB
dc.date.accessioned2008-07-14T15:10:19Zen_GB
dc.date.accessioned2011-01-25T11:55:12Zen_GB
dc.date.accessioned2013-03-20T13:23:46Z
dc.date.issued2000en_GB
dc.description.abstractThe 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.citation61 (6), pp. 6699-6704en_GB
dc.identifier.doi10.1103/PhysRevE.61.6699en_GB
dc.identifier.urihttp://hdl.handle.net/10036/31952en_GB
dc.language.isoenen_GB
dc.publisherAmerican Physical Societyen_GB
dc.relation.urlhttp://dx.doi.org/10.1103/PhysRevE.61.6699en_GB
dc.relation.urlhttp://link.aps.org/abstract/PRE/v61/p6699en_GB
dc.titleOptically guided mode study of nematic liquid crystal alignment on a zero-order gratingen_GB
dc.typeArticleen_GB
dc.date.available2008-07-14T15:10:19Zen_GB
dc.date.available2011-01-25T11:55:12Zen_GB
dc.date.available2013-03-20T13:23:46Z
dc.identifier.issn1539-3755en_GB
dc.identifier.issn1550-2376en_GB
dc.descriptionB. 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.journalPhysical Review Een_GB


Files in this item

This item appears in the following Collection(s)

Show simple item record