dc.contributor.author | FUKUDA, ATSUO | en |
dc.contributor.author | VIJ, JAGDISH KUMAR | en |
dc.date.accessioned | 2008-06-24T12:16:34Z | |
dc.date.available | 2008-06-24T12:16:34Z | |
dc.date.issued | 2007 | en |
dc.date.submitted | 2007 | en |
dc.identifier.citation | Jang-kun Song, A. D. L. Chandani, Atsuo Fukuda, J. K. Vij, Ichiro Kobayashi, and A. V. Emelyanenko, Temperature-induced sign reversal of biaxiality observed by conoscopy in some ferroelectric Sm- C* liquid crystals , Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 76, 1, 2007, 011709 | en |
dc.identifier.other | Y | en |
dc.identifier.uri | http://hdl.handle.net/2262/17662 | |
dc.description | PUBLISHED | en |
dc.description | Article number 011709 | en |
dc.description.abstract | We have studied various ferroelectric liquid crystals to find the average molecular direction of the shortest axis in the perfectly unwound state by using tilted conoscopic measurements. We find that there exist two types of temperature dependencies of the biaxiality. Some materials exhibit increasing biaxiality while others show decreasing biaxiality with increasing temperature. The former shows a temperature-induced sign reversal of biaxiality. Three different physical mechanisms are identified as responsible for the emergence of biaxiality: (i) anisotropic fluctuations of the long molecular axis, (ii) a biased rotation around the long axis, and (iii) the local field effect. By means of a simple theoretical investigation, we conclude that these two types of trends are due mainly to the opposite signs of the biaxial order parameter C, which represents the second mechanism: the biased rotation around the long axis. This means that the central phenyl planes of molecules belonging to materials having biaxiality that increases with temperature are oriented on the average parallel to the tilt plane (the shortest index of refraction axis normal to the tilt plane), and, on the contrary, in those of the others molecules are oriented perpendicular to the tilt plane (the shortest index of refraction axis lying in the tilt plane). Thus, the direction of the phenyl ring plane of the liquid crystal molecules determines the different temperature dependencies of the biaxiality. It is also shown that the phenomenon of sign reversal of the biaxiality is due to the competitive contributions of the first and second physical mechanisms. | en |
dc.description.sponsorship | We extend our grateful thanks to Mitsubishi Gas Chemical
Company for donating their valuable LCD materials. We
thank Ken Ishikawa of Tokyo Institute of Technology for
discussions on the optics of the tilted conoscopic experiment.
We acknowledge the Science Foundation of Ireland SFI Grant No. 02/IN.1/I.031 for funding the research work in
Dublin. J.K.S. thanks Samsung Electronics Co., Ltd. for
granting a leave of absence from Seoul. A.V.E. gratefully
acknowledges the support of RFBR Grant No. 06-03-08170
and of Russian Ministry of Science Grant No. MK-
2034.2006.2. We sincerely thank Professor B. K. Sadashiva
synthesizing compound 3.b.5 .We acknowledge with thanks
the grant SFI 06/RFP/ENE039. | en |
dc.format.extent | 11709 | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | en |
dc.relation.ispartofseries | Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | en |
dc.relation.ispartofseries | 76 | en |
dc.relation.ispartofseries | 1 | en |
dc.rights | Y | en |
dc.subject | Electronic & Electrical Engineering | en |
dc.title | Temperature-induced sign reversal of biaxiality observed by conoscopy in some ferroelectric Sm- C* liquid crystals | en |
dc.type | Journal Article | en |
dc.contributor.sponsor | Science Foundation Ireland | |
dc.type.supercollection | scholarly_publications | en |
dc.type.supercollection | refereed_publications | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/jvij | en |
dc.identifier.peoplefinderurl | http://people.tcd.ie/fukudaa | en |
dc.identifier.rssinternalid | 51811 | en |
dc.identifier.rssuri | http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PLEEE8000076000001011709000001&idtype=cvips&prog=normal | |
dc.identifier.rssuri | http://scitation.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PLEEE8000076000001011709000001&idtype=cvips&prog=normal | en |