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Surface stabilized topological solitons in nematic liquid crystals
Nys, Inge (Avtor), Berteloot, Brecht (Avtor), Poy, Guilhem (Avtor)

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Izvleček
Photo-alignment is a versatile tool to pattern the alignment at the confining substrates in a liquid crystal (LC) cell. Arbitrary alignment patterns can be created by using projection with a spatial light modulator (SLM) for the illumination. We demonstrate that a careful design of the alignment patterns allows the stabilization of topological solitons in nematic liquid crystal (NLC) cells, without the need for chirality or strong confinement. The created LC configurations are stabilized by the anchoring conditions imposed at the substrates. The photo-aligned background at both substrates is uniformly planar aligned, and ring-shaped regions with a 180° azimuthal rotation are patterned with an opposite sense of rotation at the top and bottom substrate. A disclination-free structure containing a closed ring of vertically oriented directors is formed when the patterned rings at the top and bottom substrate overlap. Thanks to the topological stability, a vertical director orientation in the bulk is observed even when the centra of both patterned rings are shifted over relatively large distances. The combination of numerical simulations with experimental measurements allows identification of the 3D director configuration in the bulk. A finite element (FE) Q-tensor simulation model is applied to find the equilibrium director configuration and optical simulations are used to confirm the correspondence with experimental microscopy measurements. The created LC configurations offer opportunities in the field of optical devices, light guiding and switching, particle trapping and studies of topological LC structures.

Jezik:Angleški jezik
Ključne besede:nematic liquid crystals, topological solitons, optics
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FMF - Fakulteta za matematiko in fiziko
Leto izida:2020
Št. strani:17 str.
Številčenje:Vol. 10, art. no. 840
UDK:538.9
ISSN pri članku:2073-4352
DOI:10.3390/cryst10090840 Povezava se odpre v novem oknu
COBISS.SI-ID:52294147 Povezava se odpre v novem oknu
Število ogledov:80
Število prenosov:63
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Gradivo je del revije

Naslov:Crystals
Skrajšan naslov:Crystals
Založnik:MDPI
ISSN:2073-4352
COBISS.SI-ID:36677893 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

Financer:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Številka projekta:P1-0099
Naslov:Fizika mehkih snovi, površin in nanostruktur

Financer:EC - European Commission
Program financ.:H2020
Številka projekta:834256
Naslov:Interacting optical and topological solitons in frustrated cholesterics
Akronim:OPTOSOL

Licence

Licenca:CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
Povezava:http://creativecommons.org/licenses/by/4.0/deed.sl
Opis:To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
Začetek licenciranja:18.02.2021

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:nematski tekoči kristali, topološki solitoni, optika

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