Abstract
Abstract Electric fields (d.c. or low frequency a.c.) applied perpendicular to the helical axis interact with the Chiral Smectic C (Sm C*) through coupling of the permanent polarization. The helix pitch increases on the application of electric field and unwinds completely at a critical electric field Ec , We report here the experimental observations on the variation of the helix pitch as a function of temperature in the Sm C* phase and frequency of the applied electric field. Ec required to unwind the helix has been measured for a category of Sm C* liquid crystals having: 1. negative dielectric anisotropy and low permanent polarization, 2. positive dielectric anisotropy and low permanent polarization, 3. positive dielectric anisotropy and higher permanent polarization. The results have been discussed in the light of the method used by de Gennes to calculate Ec for unwinding the helix in cholesterics and extended to the Sm C* phase by Meyer and Martinot-Lagarde, From these measurements it has been possible...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
