The case of thresholdless antiferroelectricity: polarization-stabilized twisted SmC* liquid crystals give V-shaped electro-optic response

Abstract

We have studied the three-component liquid crystal mixture reported to exhibit ‘thresholdless antiferroelectricity’ [Inui et al., J. Mater. Chem., 1996, 6, 671]. We find that the thresholdless or V-shaped switching is obtained in the absence of antiferroelectricity. This analog electro-optic response is due to the field-induced switching of a twisted smectic C* structure stabilized by polar surface interactions and by electrostatic bulk polarization charge interactions. The latter confine the director twist to thin surface regions leaving the bulk of the cell uniform, which gives good extinction at zero field. In sufficiently thin cells, such thresholdless switching can in fact be followed down to much lower temperatures, where the bulk would be antiferroelectric, but is maintained in the cells in the ferroelectric state by hysteresis from surface action.

References

1. A. Fukuda, Asia Display'95, Proceedings of the 15th International Display Research Conference, 1995, 61, 177.
2. S. Inui, N. Iimura, T. Suzuki, H. Iwane, K. Miyachi, Y. Takanishi and A. Fukuda, J. Mater. Chem., 1996, 6, 671.
3. N. A. Clark and S. T. Lagerwall, Appl. Phys. Lett., 1980, 36, 899.
4. A. Fukuda, Y. Takanishi, T. Isozaki, K. Ishikawa and H. Takezoe, J. Mater. Chem., 1994, 4, 997.
5. K. Takatoh, Presented at the FLC 97 Conference in Brest, France, 20–24 July 1997.
6. A. Fukuda, S. S. Seomun, T. Takanashi, Y. Takanashi and K. Ishikawa, Mol. Cryst. Liq. Cryst., 1997, 303, 379.
7. S. S. Seomun, Y. Takanashi, K. Ishikawa, H. Takezoe, A. Fukuda, C. Tanaka, T. Fujiyama, T. Maruyama and S. Nishiyama, Mol. Cryst. Liq. Cryst., 1997, 303, 181.
8. S. S. Seomun, B. Park, A. D. L. Chandani, D. S. Hermann, Y. Takanishi, K. Ishikawa, H. Takezoe and A. Fukuda, J. Appl. Phys., 1998, 37, L691.
9. M. Buivydas, F. Gouda, G. Andersson, S. T. Lagerwall, B. Stebler and B. Gestblom, Liq. Cryst., 1997, 23, 723.
10. D. R. Link, J. E. Maclennan and N. A. Clark, Phys. Rev. Lett., 1996, 77, 2237.
11. J.-Z. Xue, N. A. Clark and M. R. Meadows, Phys. Rev. A, 1992, 45, 6981.
12. N. A. Clark and S. T. Lagerwall, Ferroelectrics, 1984, 59, 25.
13. M. Nakagawa and T. Akahane, J. Phys. Soc. Jpn., 1986, 55, 1516.
14. Z. Zhuang, J. E. Maclennan and N. A. Clark, SPIE, 1989, 1080, 110.
15. See, for example, G. D. Smith, Numerical Solutions of Partial Differential Equations: Finite Difference Methods, 2nd edn., Clarendon, Oxford, 1978.
16. M. A. Handschy and N. A. Clark, Ferroelectrics, 1984, 59, 69.
17. Z. Zhuang, Ph. D. Thesis, University of Colorado, 1991.
18. D. W. Berreman, J. Opt. Soc. Am., 1972, 62, 502; J. Opt. Soc. Am., 1973, 63, 1374.
19. E. Gorecka, D. Pociecha, M. Glogarova and J. Mieczkowski, Phys. Rev. Lett., 1998, 81, 2941.
20. R. Shao, J. E. Maclennan, N. A. Clark, D. J. Dyer and D. M. Walba, Bull. Am. Phys. Soc., 1986, 41, 82.