Abstract
The wave equation for light traveling along the helical axis of a cholesteric liquid crystal is solved numerically with boundary conditions appropriate for light perpendicularly incident on a plane sample. The wavelength-dependent transmission coefficient is obtained for perturbed helical structure arising from the application of magnetic fields of different strengths, and the results are compared with those obtained without a magnetic field. When the helical structure is significantly perturbed, we find for linearly polarized incident light a region of partial reflection centered at half the wavelength of the primary reflection peak. For both left and right handed circularly polarized incident light, partial reflection also occurs at the same wavelength region. The polarization of the transmitted wave in each case is described.
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