dc.contributor.author | Smith, N. J. | en_GB |
dc.contributor.author | Tillin, M. D. | en_GB |
dc.contributor.author | Sambles, J. Roy | en_GB |
dc.contributor.department | University of Exeter; Sharp Laboratories of Europe Ltd., Oxford | en_GB |
dc.date.accessioned | 2008-06-05T11:11:10Z | en_GB |
dc.date.accessioned | 2011-01-25T11:54:43Z | en_GB |
dc.date.accessioned | 2013-03-20T13:22:59Z | |
dc.date.issued | 2002-02-07 | en_GB |
dc.description.abstract | Optical guided mode observations of the transient director profile (optical tensor distribution) during the relaxation of a 90° twisted nematic cell directly reveals backflow. In the first 6 ms of the relaxation process, after a voltage across the cell is removed, the midplane tilt of the director increases, reaching a maximum value of 101° at 1.4 ms. This increase in midplane tilt is attributed to coupling between fluid flow (backflow) and director reorientation. A 270° twisted state of the opposite handedness to the 90° twisted state found at equilibrium is shown to exist during the backflow period. Good fits of theoretical models with experimentally determined time dependent director profiles yield the viscosity coefficients. | en_GB |
dc.identifier.citation | Vol. 88 (8), article 088301 | en_GB |
dc.identifier.doi | 10.1103/PhysRevLett.88.088301 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10036/29579 | en_GB |
dc.language.iso | en | en_GB |
dc.publisher | American Physical Society | en_GB |
dc.rights | © 2002 American Physical Society | |
dc.title | Direct Optical Quantification of Backflow in a 90° Twisted Nematic Cell | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2008-06-05T11:11:10Z | en_GB |
dc.date.available | 2011-01-25T11:54:43Z | en_GB |
dc.date.available | 2013-03-20T13:22:59Z | |
dc.identifier.issn | 0031-9007 | en_GB |
dc.identifier.issn | 1079-7114 | en_GB |
dc.identifier.journal | Physical Review Letters | en_GB |