Applied Physics Letters
liquid, interface, energy
The popular “high-electric-field” technique to determine the polar anchoring coefficient W of a nematic–substrate interface requires the simultaneous measurement of the capacitance and optical phase retardation of a liquid crystal cell as a function of applied voltage. We develop a generalized model that makes it possible to eliminate the capacitance measurement. The new technique, called the RV (retardation versus voltage) technique, requires only themeasurement of retardation as a function of applied voltage, and allows for the determination ofW by a linear fit over a prescribed voltage window. The technique is not sensitive to uniformity of the cell thickness, does not require patterned electrodes, and allows for the local probe of thesurface. The value of W obtained by the RV technique is the same as W obtained by the traditional technique.
Natishin, Yu A.; Polak, R. D.; Shiyanovskii, Sergij V.; and Lavrentovich, Oleg (1999). Determination of Nematic Polar Anchoring from Retardation Versus Voltage Measurements. Applied Physics Letters 75(2), 202-204. doi: 10.1063/1.124319 Retrieved from http://digitalcommons.kent.edu/cpippubs/78