17. Araoka, F., Verbiest, T., Clays, K. & Persoons, A. Interactions of twisted light with chiral molecules: an experimental investigation. Phys. Rev. A 71, 055401 (2005). 18. Löffler, W., Broer, D. J. & Woerdman, J. P. Circular dichroism of cholesteric polymers and the ...