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

@article{Mllner2022DiscriminationOC,
  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},
  year={2022},
  volume={129 20},
  pages={
          207801
        }
}
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… 

Figures from this paper

References

SHOWING 1-10 OF 32 REFERENCES

Planar Chirality and Optical Spin–Orbit Coupling for Chiral Fabry–Perot Cavities

We design, in a most simple way, Fabry–Perot cavities with longitudinal chiral modes by sandwiching between two smooth metallic silver mirrors a layer of polystyrene made planar chiral by torsional

Topological liquid crystal superstructures as structured light lasers

It is shown that complex tunable microlasers emitting structured light can be generated from self-assembled topological LC superstructures containing topological defects inserted into a thin Fabry–Pérot microcavity.

Raman scattering of plane-wave and twisted light off chiral molecular liquids

We present an experimental study of the quasi–elastic Raman scattering (QES) of plane–wave– and twisted light by liquid crystals. Depending on their temperature, these crystals exhibit isotropic,

Roton-like acoustical dispersion relations in 3D metamaterials

Beyond-nearest-neighbor interactions as a mechanism in elastic and airborne acoustical metamaterials allows us to engineer roton-like acousticals dispersion relations under ambient conditions.

Temperature‐Responsive Photonic Devices Based on Cholesteric Liquid Crystals

summarized: small mesogenic PDLCs, PSLCs, and CLC polymers. For each different device are with their responsiveness and the underlying mechanisms discussed. In the of each material future device

Orbital angular momentum of twisted light: chirality and optical activity

Optical activity is conventionally understood as a natural difference in the optical responses of chiral materials with opposite handedness. It stems from the quantised spin angular momentum ±ħ per

Chirality driven topological electronic structure of DNA-like materials

It is found that this orbital texture enables the chiral molecule to polarize the quantum orbital, and it is predicted that the orbital polarization effect could induce spin-selective phenomena even in achiral but inversion-breaking materials.

Three-dimensional crystals of adaptive knots

Energetically stable, micrometer-sized knots in helical fields of chiral liquid crystals are introduced, which are robust and topologically distinct from the host medium, though they can be morphed and reconfigured by weak stimuli under conditions such as those in displays.

Superfluidity, Crystallization and Localization

It has been argued that the soft roton in liquid He4 is the precursor of weak crystallization, which freezes as a Bragg spot upon freezing. In this note we explore the competition between such a

Tweezers with a twist

The fact that light carries both linear and angular momentum is well-known to physicists. One application of the linear momentum of light is for optical tweezers, in which the refraction of a laser