PA22 Transmission Ellipsometry of the Thin 8CB Liquid Crystalline Free-Standing Films

Abstract

The incidence angle dependence of the phase difference for 100 samples of the thin 4-octyl-4'-cyanobiphenyl (8CB) liquid crystalline free-standing films (FSFs) of the 9 layers from 2 layers was measured with high resolution by transmission ellipsometry using a photoelastic modulator (PEM). There were very small dispersion, and the measurement results with the high reproducibility were obtained. The film thickness, the layer spacing and the anisotropy of the refractive indices were studied by fitting the simulated characteristics using the geometric analysis method in the SmA phase FSF to the experimental characteristics using the least-squares method.