Abstract
We investigate theoretically the effects of the angle of incidence on light transmission through cholesteric liquid crystals. The systems are two-layer sandwich structures with a twist defect created by rotation of the one layer about the helical axis. The conoscopic images and polarization-resolved patterns are obtained for thick layers by computing the intensity and the polarization parameters as a function of the incidence angles. In addition to the defect angle-induced rotation of the pictures as a whole, the rings associated with the defect mode resonances are found to shrink to a central point and disappear, as the defect twist angle varies from zero to its limiting value π/2 and beyond.
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This work was partially supported by STCU Grant No. 4687.
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Egorov, R.I., Kiselev, A.D. Conoscopic patterns in photonic band gap of cholesteric liquid crystal cells with twist defects. Appl. Phys. B 101, 231–234 (2010). https://doi.org/10.1007/s00340-010-4028-4
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DOI: https://doi.org/10.1007/s00340-010-4028-4