Cholesterics

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Abstract
The helical arrangement characteristic of the cholesteric phase has been presented in Chapter 1. In this ideal state the director n(r) varies in space according to the law where we have taken the helical axis along z. A cholesteric single crystal, described by eqns (6.1) and (6.2), can often be obtained in thin slabs (thickness d in the 100 µm range) provided that the boundary conditions on both sides of the slab are tangential. The configuration is represented in Fig. 6.1; it is usually called the ‘planar texture’ or ‘Grandjean texture’. Typical examples include the following.

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