Prakash, J. and Mehta, D. S. and Choudhary, A. and Kaur, S. and Rathore, V. and Biradar, A. M. (2008) Criticality of bistability phenomenon in deformed helix ferroelectric liquid crystal. Journal of Applied Physics, 103 (4). 044103-1. ISSN 1089-7550

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Abstract

The dynamics of bistability in deformed helix ferroelectric liquid crystal have been investigated by electro-optical method. The threshold value of the voltage required to switch the molecules of deformed helix ferroelectric liquid crystals (DHFLC) material has been studied by applying triangular wave pulse and texture observation under polarizing microscope. Two peaks have been observed in low and high frequency regimes on the application of triangular wave pulse to the sample. It has been proposed that the first peak is due to helix unwinding-winding process and the second is due to molecular reorientation process. The occurrence of double peak has been predicted to have close correlation with the observance of memory effect in DHFLC material, which is critically dependent on frequency and applied voltage, on the application of time delayed square wave pulse to the sample cell. The conditions for dynamic and static memory effects in DHFLC material have also been discussed in detail.

Item Type:	Article
Subjects:	Physics
Divisions:	UNSPECIFIED
Depositing User:	Ms Neetu Chandra
Date Deposited:	23 Jan 2013 11:51
Last Modified:	23 Jan 2013 11:51
URI:	http://npl.csircentral.net/id/eprint/965

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