Abstract
We report the results of the effect of a large electric field on the TGB C* phase in a material exhibiting the TGB A to TGB C* phase transition. Here the TGB A phase corresponds to a twist grain boundary phase with smectic A (Sm A) blocks, while TGB C* refers to the twist grain boundary phase with smectic C* (Sm C*) blocks and exhibiting textural features of both the smectic C* and TGB phases. With the sample aligned in the planar geometry, the TGB C* phase shows a square-grid pattern under a polarizing microscope. In this geometry, application of an a.c. electric field of a few V/ w m, perpendicular to the TGB helix in the TGB C* phase, results in the square-grid pattern changing over to a finger-print texture, as also confirmed by optical diffraction. We provide a possible explanation for this behaviour.
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