1. Liquid Crystal Institute, Kent State University, Kent, Ohio 44242, United States
2. Chemical and Biological Engineering, University of Wisconsin−Madison, Madison, Wisconsin
53706, United States
3. Physics Department, Kent State University, Kent, Ohio 44242, United States
4. Institute for Solid State Physics and Optics, Wigner
Research Centre for Physics, Hungarian Academy of Sciences, P.O. Box. 49, H-1525 Budapest, Hungary