Transient Pheonomena of Cholestesric Liquid Crystals under the Electric Field
Cholesteric liquid crystals are the prominent candidate materials for reflective display devices. But the speed of switching is so slow that for the cholesteric liquid crystals to be applied to video rate displays, this obstacle must be overcome, Therefore to understand the evolution mechanism of the homeotropiccholesteric transition, both experimental and computational stuies of this transient phenomena are actively undergoing.
Photonic Band Gap and Defect Modes of Cholesteric Liquid Crystals
Potonic crystals are the materials which have at least one photonic forbidden gap. It is understood that the periodic modulation of the wave im pedance of materials gives rise to the gap formation When the defects that break the periodicities are intorduced, the defect modes appear in the forbidden gap. Properties of defect modes of cholesteric liquid crystals are studies by theoretical calculations.
Interfacial Problems between Liquid Crystals and Organic Substrates
Rubbing the substate is widely used to align the liquid crystal molecules unidirectionally. But the electrochemical interaction between the liquid crystals and substrates hav not been understood clearly. Currently we are trying to find the key physical parameters experimentally which determine the alignment pruperties such as pretilt angle and anchoring energy.
Switching Dynamics of Surface Stabilized Ferroelectric Liquid Crystals
Surgace stabilized ferroelectric liquid crystals(SSFLC) have fast response time(few 10us)due to their spontaneous polarization and have two stable configurations without external electric field Switching dynamics and polarization reversals of SSFLC ar under study via numerical calculation method for the cells of various thicknesses and varying the dielectric constants of dielectric substrates like insulation layer or alignment layer.
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