Hostname: page-component-cd9895bd7-p9bg8 Total loading time: 0 Render date: 2024-12-24T13:02:37.307Z Has data issue: false hasContentIssue false
  • English
  • Français

Effect of Side Chain Substitution on the Field-Dependent Birefringence in a Series Of Chiral Smectic a Liquid Crystals

Published online by Cambridge University Press:  10 February 2011

J. R. Lindle ,
F. J. Bartoli ,
S. R. Flom ,
J. V. Selinger ,
R. Shashidhar  and
B. R. Ratna
J. R. Lindle
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5338
F. J. Bartoli
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5338
S. R. Flom
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5338
J. V. Selinger
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5338
R. Shashidhar
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5338
B. R. Ratna
Affiliation:
Naval Research Laboratory, Washington, DC 20375-5338
Get access

Abstract

The field dependent birefringence and the tilt angle are measured for a series of four electroclinic liquid crystals. The zero-field birefringence decreased significantly and monotonically with the length of the siloxane side chain. For all four samples, the birefringence and the electroclinic tilt angle increased substantially with the application of a field. At 10 V/µm, the electroclinic tilt angle in DSiKN65 and TSiKN105 exceeded 22.5 degrees and the phase retardation due to the change in the birefringence exceeded a quarter wave. In all four liquid crystals, the electroclinic tilt angle and the field-dependent birefringence were shown to be strongly correlated, suggesting a common origin. Moreover, this correlation persists even at high fields where both processes undergo saturation. A simple orientational model, based on a distribution in the molecular optical axis, was developed to explain the large change in birefringence in the substituted compounds as well as the dependence of δn on electric field.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 559: Symposium D – Liquid Crystals Materials and Devices , 1999 , 33
Copyright
Copyright © Materials Research Society 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1 Bartoli, F. J., Lindle, J. R., Flom, S. R., Selinger, J. V., Ratna, B. R., andShashidhar, R., Phys. Rev E 55, R1271 (1997).Google Scholar
2 Naciri, J., Ruth, J., Crawford, G., Shashidhar, R., andRatna, B. R., Chem. Mater. 7, 1397 (1995).Google Scholar
3 Born, M. and Wolf, E., Principles of Optics, 5nd Ed. (Pergamon Press, New York, 1975) p 695.Google Scholar
4 This is supported by the finding that much more pronounced stripe deformations are observed for KN 125, which tilts as a rigid rod, than for the organosiloxanes.Google Scholar
5 Crawford, G. P., Geer, R. E., Naciri, J., Shashidhar, R., andRatna, B. R., Appl. Phys. Lett. 65, 2937 (1994).Google Scholar
6 Yang, F., Sambles, J. R., andBradbury, G. W., J. Appl. Phys. 78, 2187 (1995).Google Scholar