Details
| Original language | English |
|---|---|
| Pages (from-to) | 959-965 |
| Number of pages | 7 |
| Journal | Low temperature physics |
| 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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)
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In: Low temperature physics, Vol. 47, No. 11, 11.2021, p. 959-965.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Raman scattering of plane-wave and twisted light off chiral molecular liquids
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.
UR - http://www.scopus.com/inward/record.url?scp=85120734799&partnerID=8YFLogxK
U2 - 10.1063/10.0006577
DO - 10.1063/10.0006577
M3 - Article
AN - SCOPUS:85120734799
VL - 47
SP - 959
EP - 965
JO - Low temperature physics
JF - Low temperature physics
SN - 1063-777X
IS - 11
ER -