Twist Defect in an Imprinted Cholesteric Elastomer*

We have found that a chiral twist defect inserted in a cholesteric elastomer gives rise to circularly polarized localized modes of both handedness. This defect enhances the resonance mode amplitude whose handedness is opposite to the cholesteric helix for high cross-linked density. Complementarily, for low cross-linked density, the circular polarization opposite to helix cholesteric of the elastomer is decoupled with the defect mode so that the resonance mode disappears . Finally, the resonance mode of the circularly polarization of the same handedness to elastomer helix is maintained either, for high or low cross-linked density.