Discrimination of Chiral and Helical Contributions to Raman Scattering of Liquid Crystals Using Vortex Beams.

  title={Discrimination of Chiral and Helical Contributions to Raman Scattering of Liquid Crystals Using Vortex Beams.},
  author={Silvia M{\"u}llner and Florian B{\"u}scher and Angela M{\"o}ller and Peter Lemmens},
  journal={Physical review letters},
  volume={129 20},
We use vortex photon fields with orbital and spin angular momentum to probe chiral fluctuations within liquid crystals. In the regime of iridescence with a well-defined pitch length of chirality, we find low energy Raman scattering that can be decomposed into helical and chiral components depending on the scattering vector and the topological charge of the incident photon field. Based on the observation of an anomalous dispersion we attribute quasielastic scattering to a transfer of angular… 

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