Details
| Translated title of the contribution | Raman scattering of plane-wave and twisted light off chiral molecular liquids |
|---|---|
| Original language | Undefined/Unknown |
| Pages (from-to) | 1045-1052 |
| Number of pages | 8 |
| Journal | Fizika Nizkikh Temperatur |
| Volume | 47 |
| Issue number | 11 |
| Publication status | Published - Nov 2021 |
| Externally published | Yes |
Abstract
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 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 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 liquid crystal.
Keywords
- Liquid crystals, Quasi-elastic Raman scattering, Twisted light
ASJC Scopus subject areas
- Physics and Astronomy(all)
- General Physics and Astronomy
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In: Fizika Nizkikh Temperatur, Vol. 47, No. 11, 11.2021, p. 1045-1052.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Раманівське розсіювання плоскохвильового та скрученого світла від хіральних молекулярних рідин
AU - Büscher, Florian
AU - Müllner, Silvia
AU - Wulferding, Dirk
AU - Pashkevich, Yu G.
AU - Gnezdilov, V.
AU - Peshkov, A. A.
AU - Surzhykov, A.
AU - Lemmens, Peter
N1 - Funding information: We acknowledge important discussions with W. Löffler (Univ. Leiden) and G. Napoli (Univ. del Salento, Lecce). This research was funded by DFG EXC-2123-390837967 Quantum-Frontiers, DFG Le967/16-1, DFG-RTG 1952/1, and the Quantum-and Nano-Metrology (QUANOMET) initiative of Lower Saxony within project NL-4. D. W. acknowledges support from the Institute for Basic Science (Grant No. IBS-R009-Y3). _______
PY - 2021/11
Y1 - 2021/11
N2 - 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 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 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 liquid crystal.
AB - 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 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 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 liquid crystal.
KW - Liquid crystals
KW - Quasi-elastic Raman scattering
KW - Twisted light
UR - http://www.scopus.com/inward/record.url?scp=85116544271&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:85116544271
VL - 47
SP - 1045
EP - 1052
JO - Fizika Nizkikh Temperatur
JF - Fizika Nizkikh Temperatur
SN - 0132-6414
IS - 11
ER -