Electrically Controlled Negative Refraction in a Nematic Liquid Crystal
Applied Physics Letters
The authors demonstrate electrically controlled negative refraction at the interface between an isotropic material and a uniaxial nematic liquid crystal, in which the optic axis is designed to make a large angle with the interface. Depending on the applied voltage, the refracted beam is either on the opposite side of the interface normal as compared to the incident beam (positive refraction) or on the same side (negative refraction).
Pishnyak, Oleg P. and Lavrentovich, Oleg (2006). Electrically Controlled Negative Refraction in a Nematic Liquid Crystal. Applied Physics Letters 89(25). doi: 10.1063/1.2408658 Retrieved from http://digitalcommons.kent.edu/cpippubs/186