The Acousto-Optic Effect for a Nematic Liquid Crystal in the Presence of an Applied Electric Field
It has been over forty years since Frederiks and Zolin1 observed the acousto-optic effect. They used tuning forks from 200 to 600 Hz and acoustically excited a nematic. The cause of the effect was attributed to a rotation of the optic axis although no details for the mechanism were given. In the last eight years there has been a renewed interest in the effect with a number of quantitative studies performed.1–8 Most of the experimental reports refer to a threshold of acoustic intensity required before the effect occurs. The first two theoretical explanations for the effect also predict such a threshold.6,9 In 1976 experimental results were presented which indicated there was no threshold for the effect.10–12 Two of these reports10,11 indicate the mechanism responsible for the effect is acoustic streaming, although the formulation in each case is quite different.
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- 1.V.V. Zolina, Trudy Lomonosov Inst. Akad. Nauk SSSR 8, 11 (1936).Google Scholar
- 2.L.W. Kessler and S.P. Sawyer, Appl.Phys.Lett. 17, 440 (1970).Google Scholar
- 5.P. Greguss, Acustica 29, 52 (1973),Google Scholar
- 11.S. Candau, A. Peters and S. Nagai, Sixth International Liquid Crystal Conference J-30 (1976).Google Scholar
- 12.J. L. Dion and F. De Forest, Sixth International Liquid Crystal Conference K-18 (1976).Google Scholar