Report
Raman scattering of plane-wave and twisted light off chiral molecular liquids
| العنوان: | Raman scattering of plane-wave and twisted light off chiral molecular liquids |
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| المؤلفون: | Büscher, Florian, Müllner, Silvia, Wulferding, Dirk, Pashkevich, Yurii G., Gnezdilov, Vladimir, Peshkov, Anton A., Surzhykov, Andrey, Lemmens, Peter |
| سنة النشر: | 2021 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Physics - Optics, Condensed Matter - Soft Condensed Matter, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | 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 can exhibit isotropic, nematic and chiral nematic phases. The question is addressed of how the phase of a crystal and the state of incident light can affect the quasi-elastic energy spectra of the scattered radiation, whose shape is usually described by the combination of Lorentzian and Gaussian components. Special attention is paid to the \textit{chiral phase}, for which the Raman QES spectrum is dominated by a Lorentzian with reduced linewidth, pointing to diminished disorder and configurational entropy. Moreover, this phase is also known for a regime of iridescence (selective backscattering) which arises when the wavelength of incident light becomes comparable with the chiral pitch length. Detailed measurements, performed in this \textit{resonant} regime and by employing twisted light, carrying various projections of the orbital angular momentum (OAM), have indicated a low-energy scattering surplus depending on OAM. We argue that this observation might indicate a transfer of angular momentum between light and the liquid crystal. Comment: 4 figures, two References added and ACKNOWLEDGMENT, submitted to Low Temperature Physics/Fizika Nizkikh Temperatur 47, No. 11, (2021) |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1063/10.0006577 |
| URL الوصول: | http://arxiv.org/abs/2107.10589 |
| رقم الانضمام: | edsarx.2107.10589 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1063/10.0006577 |
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