We report on a unipolar electro-optic effect in a nematic liquid crystal cell. The cell placed between two polarizers behaves as an "optical diode:" only one polarity of the applied voltage makes the cell transparent. The phenomenon is caused by a double symmetry breaking at the two plates that bound the nematic slab.
Physical Review E
Copyright 1998 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.57.R36
Nazarenko, V. G.; Klouda, R.; Lavrentovich, Oleg (1998). Unipolar Electro-Optic Effect in a Nematic Cell. Physical Review E 57(1) R36-R38. doi: 10.1103/PhysRevE.57.R36. Retrieved from https://oaks.kent.edu/cpippubs/207