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The chiral optical Tamm state is a new localized state of light at theinterface between a polarization-preserving anisotropic mirror and an opticallychiral medium such as a cholesteric liquid crystal. In this study themetal-free polarization-preserving mirror is used for efficient resonancecontrol. We stress the advantage of the all-dielectric structure in obtaininghigh Q factor. The light is localized near the interface and the fielddecreases exponentially with the distance from the interface. The penetrationof the field into the chiral medium is virtually blocked at wavelengthscorresponding to the photonic band gap and close to the pitch of the helix. Thepolarization-preserving mirror has another photonic band gap as well. Ouranalytics agrees well with precise calculations, enabling intelligent designfor laser and sensing applications.

Chiral Optical Tamm States at the Interface between a Cholesteric and an All-Dielectric Polarization-Preserving Anisotropic Mirror