Novel Approach to Alignment Change in LCs through Photochemical Processes

Photochemical phase transition response time has been investigated in detail. 

The response time is one of the crucial factors in the manipulation of light waves by means of refractive index modulation by light-induced change in alignment of LCs. 

Novel Approach to Alignment Change in LCs through Photochemical Processes 

To obtain fast LC photoresponse, a new guest/host system was developed, in which ferroelectric LCs (FLCs) were used as a host LC. FLCs exhibit spontaneous polarization (Ps) and show microsecond responses to change in applied electric field (flip of polarization) in a surface-stabilized state.1261 If a flip of polarization of FLC molecules in the surface-stabilized state can be induced by light in the presence of an applied electric field, photoresponse in the microsecond time region might be achievable. 

FLC host systems notably the effects of structure of FLC hosts,[29 301 structures of photochromic guests,1311 temperature,1321 bias voltage,1281 and change in Ps.1321 

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