In case of heterogeneous planar orientation of LC mostly S±1 and 1/2 Schlieren Texture are present but in homeotropic aligned LC with negative dielectric anisotropy S± 1/2 doesn't appear.
Can someone tell me the reason behind this I am new to LC materials.
Alan F Rawle
The phase is uniaxial in the homeotropic (vertical) alignment orientation. See: https://bly.colorado.edu/lcphysics/textures/. This is not the case, of course, with homogeneous (parallel) alignment.
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