This paper illustrates the conoscopic observation of a molecular reconstruction occurring across a nematic liquid crystal (NLC) medium in the presence of an external electric field. Conoscopy is an optical interferometric method, employed to determine the orientation of an optic axis in uniaxial crystals. Here a planar aligned NLC medium is used, and the topological changes with respect to various applied voltages are monitored simultaneously. Homogenous planar alignment is obtained by providing suitable surface treatments to the ITO coated cell walls. The variation in the conoscopic interferometric patterns clearly demonstrates the transition from planar to homeotropic state through various intermediate states.
© 2014 Optical Society of America
Original Manuscript: February 18, 2014
Revised Manuscript: March 17, 2014
Manuscript Accepted: March 21, 2014
Published: April 23, 2014
Radhakrishnan Ranjini, Murukeshan Vadakke Matham, and Nam-Trung Nguyen, "Conoscopic analysis of electric field driven planar aligned nematic liquid crystal," Appl. Opt. 53, 2773-2776 (2014)