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Blue phase liquid crystal (BPLC) has important applications in adaptivelenses and phase modulators due to its polarization-independent property.During our efforts for development of the new materials, we found a novelphenomenology of phase transition, from focal conic smectic to smectic bluephase in a partially fluorinated cyanophenyl alkyl benzoate ester based nematicliquid crystal (LCM-5773) doped by ultra-high twisting power [H.T.P~160 um^-1]chiral dopant (R5011/3 wt%). Polarized optical microscopy (POM) investigationsrevealed focal conic and fan-shaped textures typical for columnar mesophases.These focal conic domains (FCDs) are squeezed under electric field and finallyat a critical electric field they undergo a dark state. When the electric fieldis withdrawn, the FCDs are regrown in a one dimensional array with smallerdomain size. Interestingly, we have observed the domain size of the FCDs cangrow several times by decreasing the cooling rate (0.02 degrees(C)/min.) tentimes without any change in the phase sequence. In blue phase (BP), we haveobserved curved platelet texture and grain boundaries filled by smallplatelets, which is completely different from conventional cholesteric BP. Theblue phase platelet size (PLS) also increases significantly at low coolingrates. The thermal control of FCD and PLS size has increasing demand for theconstruction of devices with optimal performances.

Phase transition from focal conic to cubic smectic blue phase in  partially fluorinated cyano-phenyl alkyl benzoate ester doped with ultrahigh  twisting power chiral dopant