Journal
PHYSICAL REVIEW E
Volume 80, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevE.80.041707
Keywords
cholesteric liquid crystals; finite difference methods; fluorescence; liquid structure; liquid theory
Categories
Funding
- Engineering and Physical Sciences Research Council (U.K.)
- Merck
- Engineering and Physical Sciences Research Council [EP/F013787/1] Funding Source: researchfish
- EPSRC [EP/F013787/1] Funding Source: UKRI
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The symmetry of the cholesteric uniform lying helix (ULH) structure, where the helix axis is aligned in a single direction parallel to the device substrates, is not compatible with a uniform surface alignment and an unwinding of the helical structure is expected at the interface. Fluorescence confocal polarizing microscopy experiments are performed on the interface between a bulk ULH and a uniform aligning surface (for both planar and homeotropic alignments). The results are analyzed in the framework of a finite difference numerical simulation based on the Frank elastic distortion, to determine relevant director structures. An optical model is introduced to predict three-dimensional fluorescence profiles for the structures. Comparison of experimental and theoretical results shows that the equilibrium structure of the system involves a continuous unwinding of the helix close to the surface.
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