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We have carried out a spectroscopic study on a prototype ferroelectricnematic material (RM7343) doped with a non-polar chiral compound. The mixturepresents two chiral nematic phases, one conventional (N*) and the other polar(NF*), whose behaviours under electric fields E are totally different. On theone hand, the N* phase shows a single reflection band if E is not very high,while fields perpendicular to the helix of a few V/mm are already sufficient toproduce multiple bands in the NF* phase. On the other hand, the pitch of theNF* phase grows notably on increasing fields, however remaining practicallyconstant in the N* phase. Both effects have been explained in terms of thedifferent type of interaction with E in each phase (ferroelectric in NF* anddielectric in N*). We argue that the NF* phase behaves as a photonic materialwith multiple gaps tunable by small fields, which presents importantpotentialities for applications. A study of the bandgaps has been carried outthrough the analysis of the dispersion relation of the optical eigenmodes inthe NF* phase under field. Finally, an example of the potentialities of the NF*phase within the field of nonlinear optics is briefly presented.

Ferroelectric chiral nematic liquid crystals: New photonic materials with multiple bandgaps controllable by low electric fields