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(Color) (a) Schematic of a square inhomogeneous alignment pattern with adjacent domains preferring orthogonal alignment directions. (b) A sketch of the planar LC configuration on inhomogeneous alignment pattern as that in (a) (left) above and (right) below the transition period for LC pretilt jump. (c) Optical images of the LC cells, made of checkerboard grooved patterns with varied from , between crossed polarizers. The double-headed arrows indicate the orientations of the polarizer (along ) and analyzer (along ). The patterns are mostly in size. The quoted values of and were deduced by model-fitting the normalized reflection spectra of each cell.
Normalized reflection spectra of the and cells. Solid lines are measurements. Dashed lines are simulations. The entrance polarizer was along during measurement.
Plot of LC pretilt against groove depth. Solid circles are data. Dashed line is obtained by calculations with the frustrated boundary model assuming the azimuthal surface energy to vary as (see Ref. 5 for details).
Surface potentials of uniform LC states, , on checkerboard grooved patterns with different groove depths obtained from Eq. (1) assuming , , and at , and . The arrows indicate the minimum of the curves.
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