Optical properties of the interface between a twisted liquid crystal and an isotropic transparent medium

For pt. I see ibid., vol. 24, p. 153, 1993. In the present Part II, we describe the experiments that have been performed in order to confirm theoretical predictions (Part I) dealing with optical properties of the interface between a twisted birefringent mesophase and an isotropic medium; the interface is illuminated at normal incidence, in the direction of the screw axis, with wavelengths sited in the well-known selective reflection band of the mesophase. For each direction of the interface crossing the characteristics of the reflected and transmitted rays are determined and compared to the incident ones: occurring differences from theoretical predictions are explained. When a circularly left-handed wave propagating in a dextro mesophase reaches the interface, the polarimetric determination of the transmitted wave enables the orientation of the mesophase director to be reached at the interface.