Skip to main content Accessibility help

Technique for Measuring Electronic-Based Electro-Optic Coefficients of Ferroelectric Liquid Crystals

  • Kenneth E. Arnett (a1), David M. Walba (a2) and Joel A. Drewes (a2)


Among soft organic nonlinear optical materials is a class of recently developed: χ(2)_ enhanced ferroelectric liquid crystals (FLCs). The FLC phase nonlinear susceptibility is enhanced by synthesizing onto the molecules constituting the FLC phase a moiety with an increased hyperpolarizability. The hyperpolarizability of the FLC molecules couples into the permanent, thermodynamically stable, polar order of the FLC phase resulting in a material with an enhanced nonlinear susceptibility. Like other soft organics, the linear and nonlinear optical materials characteristics can be altered by chemical synthesis and mixing.

We report on our technique to evaluate the nonlinear optical properties of χ(2)-enhanced FLCs by measuring their high-frequency electro-optic r-coefficients. The technique is broad-band, readily allowing electro-optic coefficient measurement between 100 KHz and 200 MHz. Although the experimental geometry is not conducive for practical device application, it offers a compromise between ease of fabrication and magnitude of nonlinear response. This technique can also be used to evaluate other organic materials such as poled polymers.



Hide All
1 Lagarwall, S.T. and Dahl, I., “Ferroelectric Liquid Crystals,” Mol. Cryst. Liq. Cryst. 114, 151 (1984); N. A. Clark and S.T. Lagarwall, “Surface-stabilized ferroelectric liquid crystal electrooptics: new multistate structures and devices,” Ferroelectrics 59, 25 (1984).
2 Prasad, P.N. and Williams, D.J., Intro. to Nonlinear Optical Effects in Molecules and Polymers, (John Wiley and Sons, N.Y., 1991).
3 Walba, D.M., Ros, M.B., Clark, N.A., Shao, R., Johnson, K.M., Robinson, M.G., Liu, J.Y., and Dorowski, D., Mol. Cryst. Liq. Cryst. 198, 51 (1991).
4 Chemla, D.S. and Zyss, J., Nonlinear Optical Properties of Organic Molecules and Crystals (Academic Press, N.Y. 1987, vol 1).
5 Vtyurin, A. N., Yermakov, V.P., Osrovsky, B.I. and Shavanov, V.F., Krystallografiya 26, 546 (1981).
6 Taguchi, A., Ouchi, Y., Takezoe, H., and Fukuda, A., Jap. J. App. Phys. 28, L997 (1989); J.Y. Liu, M.G. Robinson, K.M. Johnson, and D. Dorowski, Opt. Lett 15, 267 (1990).
7 Walba, D.M., Ros, M.B., Sierra, T., Rego, J.A., Clark, N. A, Shao, R., Wand, M.D., Vohra, R.T., Arnett, K., and Velsko, S., Ferroelectrics 121, 247 (1991).
8 Arnett, K., Velsko, S., and Walba, D., Appl. Phys. Lett. 64, 2919 (1994).
9 Schmitt, K., Benecke, C., Schadt, M., Funfschilling, J., Herr, R.P., Buchecker, R., J. Phys. III (Fr) 4, 387 (1994).
10 Walba, D., Dyer, D., Cobben, P., Sierra, T., Rego, J., Liberko, C., Shao, R., and Clark, N., in this volume.
11 Micro-g Solutions, 5558 Harlan St., Arvada, Colorado, 80002 (303)-422–8744.


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed