Abstract
The optical properties of the liquid-crystal analogue of the Abrikosov phase, the TGBA phase, have been examined for the first time using the Kossel technique. The Kossel diagrams observed between crossed polarizers each consist of a bright annulus on which a darker spiral pattern is superimposed. Identical patterns have been reported and explained previously for the chiral nematic phase and the results presented here indicate that the optics of the TGBA phase are analogous to those of the cholesteric phase. Both the pitch and handedness of the TGBA phase have been measured from the Kossel diagrams. The pitch of the material was found to be approximately linear with temperature, ranging from around 550 nm at the TGBA-to-SmC*α phase boundary to 450 nm at the TGBA-to-isotropic phase boundary.
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