OPTICAL MEASUREMENTS OF STRONG ANCHORING ENERGIES IN NEMATIC LIQUID CRYSTALS

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In this thesis we present some measurements of azimuthal anchoring energies for the nematic liquid crystal 5CB. The 5CB was in contact with glass surfaces covered with a thin polyimide substrate (Nissan corporation, SE-3510), that has been rubbed along a given direction. The glass surfaces were supplied by Stephane Joly of NEMOPTIC industry. Two different experimental methods -recently proposed by our group- have been used: a reflectometric method and a transmission method. Both these methods use a monocromatic laser beam (Laser He-Ne). In these subsrates we have measured a very high anchoring energy: Wa=3.5 10^(-4)J/m^2 (at T=25