We have shown experimentally that some cholesteric liquid crystals in cells with parallel or skew director orientations at the two surfaces may be made to have two bistable laminar states that can be switched either way by applying temporary electric potentials between the surfaces. Numerical solutions of the Oseen‐Frank equations in the laminar case, augmented with cholesteric twist and electric field terms, confirm the bistability. Numerical solutions of the Leslie‐Ericksen hydrodynamic equations in the laminar case, similarly augmented, describe the switching mechanism. We have made and operated several such cells.
REFERENCES
1.
2.
T. J. Scheffer, Symposium on the Physics and Chemistry of Liquid Crystal Devices, IBM San Jose, Calif. 1979, edited by G. Sprokel (Plenum, New York) (to be published).
3.
4.
T. J. Scheffer, presented at the International Conference Liquid on Crystals, Budapest, Aug., 1979 (unpublished).
5.
6.
C. J.
Gerritsma
, J. J. M.
deKlerk
, and P.
vanZanten
, Solid State Commun.
17
, 1077
(1975
).7.
8.
9.
10.
G. D.
Boyd
, J.
Cheng
, and P. D. T.
Ngo
, Appl. Phys. Lett.
36
, 556
(1980
).11.
W. R.
Heffner
, D. W.
Berreman
, M.
Sammon
, and S.
Meiboom
, Appl. Phys. Lett.
36
, 15
(1980
).12.
W. A.
Crossland
, J. H.
Morrissy
, and B.
Needham
, J. Phys. D
9
, 2001
(1976
).13.
The surfactant was AMC‐72 in 0.05% aqueous solution obtained from Atomergic Chemical Co., Plainview, New York.
14.
15.
P. G. deGennes, The Physics of Liquid Crystals (Clarendon, Oxford, 1975), Eq. (6.43).
16.
E. P.
Raynes
, R. J. A.
Tough
, and K. A.
Davies
, Mol. Cryst. Liq. Cryst. Lett.(GB)
56
, 63
(1979
).17.
18.
P. E. Cladis (private communication).
19.
20.
21.
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© 1981 American Institute of Physics.
1981
American Institute of Physics
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