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FULLY-LEAKY GUIDED MODE MEASUREMENT OF THE FLEXOELECTRIC CONSTANT (e11+e33) OF A NEMATIC LIQUID CRYSTAL

The response to applied voltages of the director profile within an E7-filled Hybrid Aligned Nematic liquid crystal cell has been determined by using the optical wave-guide method known as the Fully-Leaky Guided Mode Technique. Data was collected with applied AC and DC voltages and the measured director profiles were compared with model profiles generated through a minimisation-of-free-energy routine. The sum of the splay and bend flexoelectric coefficients (e11+e33 of E7 was measured as 1.5×10−11Cm−1. Results also show the presence of a DC offset voltage of +0.64 V in the cell.