Qualitative chirality effects on the Casimir-Lifshitz torque with liquid crystals
We model a cholesteric liquid crystal as a planar uniaxial multilayer system, where the orientation of each layer differs slightly from that of the adjacent one. This allows us to analytically simplify the otherwise acutely complicated calculation of the Casimir-Lifshitz torque. Numerical results...
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| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/160707 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | We model a cholesteric liquid crystal as a planar uniaxial multilayer system,
where the orientation of each layer differs slightly from that of the adjacent
one. This allows us to analytically simplify the otherwise acutely complicated
calculation of the Casimir-Lifshitz torque. Numerical results differ
appreciably from the case of nematic liquid crystals, which can be treated like
bloc birefringent media. In particular, we find that the torque deviates
considerably from its usual sinusoidal behavior as a function of the
misalignment angle. In the case of a birefringent crystal faced with a
cholesteric liquid one, the Casimir-Lifshitz torque decreases more slowly as a
function of distance than in the nematic case. In the case of two cholesteric
liquid crystals, either in the homochiral or in the heterochiral configuration,
the angular dependence changes qualitatively as a function of distance. In all
considered cases, finite pitch length effects are most pronounced at distances
of about 10 nm. |
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