Stokes-parameter analysis of the polarization of light transmitted through a chiral nematic liquid-crystal cell

• Main Authors: Woon, K.L., O'Neill, M., Richards, G.J., Aldred, M.P., Kelly, S.M.
• Format: Article
• Published: Optical Society of America 2005
• Subjects: Q Science (General); QC Physics
• Online Access: http://eprints.um.edu.my/12897/; http://www.opticsinfobase.org/josaa/abstract.cfm?uri=josaa-22-4-760; http://dx.doi.org/10.1364/JOSAA.22.000760

A spectroscopic Stokes polarimeter is used to directly measure the linearly, circularly, and randomly polarized components of light obtained on transmission of unpolarized light through thick chiral nematic liquid-crystal cells in the stop band. The Stokes parameters are simulated to fit the experimental data by use of the Berreman 4 × 4 transfer matrix by means of the Jones and Stokes vectors and taking into account multiple reflections at the interfaces of the cell. Excellent agreement is obtained. The transmitted light through a commercial cell is mainly circularly polarized at normal incidence, but a significant linearly polarized component is also observed. The model shows that this results from refractive-index mismatching at the liquid-crystal–alignment-layer interface, but a small linearly polarized component remains even with optimized index matching. An improved device configuration incorporating random defects at the exit boundary of the liquid crystal gives a highly circularly polarized output with virtually no linear or unpolarized components.