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Optical confirmation of biaxial nematic (Nb) phase in a bent-core mesogen

Appl. Phys. Lett. 95, 183304 (2009); doi:10.1063/1.3255013

Published 3 November 2009

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Yun Jang,1 Vitaly P. Panov,1 Antoni Kocot,1,3 J. K. Vij,1 A. Lehmann,2 and C. Tschierske2
1Department of Electronic and Electrical Engineering, Trinity College Dublin, Dublin 2, Ireland
2Institute of Organic Chemistry, Martin Luther-University Halle-Wittenberg, Halle D 06120, Germany
3Institute of Physics, Silesian University, Katowice PL40-007, Poland
A bent-core mesogen with different end groups has been studied for different surface conditions in both planar and homeotropic cells using techniques for measuring biaxiality and optical switching. Biaxial nematic phase observed in between the uniaxial nematic and smectic phases is evidenced by a sharp increase in the biaxiality in a homeotropic cell measured using a photoelastic modulator. The material in this phase is switchable through the minor director with an in-plane electric field. In a planar cell, a step in the difference in the refractive indices resulting from the uniaxial to biaxial transition is also observed. ©2009 American Institute of Physics
History: Received 2 July 2009; accepted 6 October 2009; published 3 November 2009
Permalink: http://link.aip.org/link/?APPLAB/95/183304/1
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KEYWORDS and PACS

Keywords
PACS
  • 61.30.Eb
    Experimental determinations of smectic, nematic, cholesteric, and other structures
  • 64.70.mj
    Experimental studies of liquid crystal transitions
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
Publisher:
AIP is a member of CrossRef AIP

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