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Ring-shaped liquid crystal structures through patterned planar photo-alignment
Berteloot, Brecht (Avtor), Nys, Inge (Avtor), Poy, Guilhem (Avtor), Beeckman, Jeroen (Avtor), Neyts, Kristiaan (Avtor)

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Izvleček
Patterned liquid crystal (LC) configurations find widespread applications in functional devices such as lenses, gratings, displays and soft-robots. In combination with external stimuli such as an applied electric field, photo-alignment at the surfaces offers an attractive way to stabilize different LC structures in the bulk of a device. Herein, a planar LC cell is developed using a photo-alignment layer at the bottom substrate and a rubbed nylon film at the top substrate. Patterned planar photo-alignment is achieved by modulating the linear polarization with a spatial light modulator (SLM) and projecting the pattern onto the bottom substrate. A ring pattern is written into the photo-alignment layer with a continuous rotation between an inner radius and an outer radius. In the other regions the alignment is parallel to the rubbing direction at the top substrate. Four different LC configurations are observed: structure A in which a ring-shaped region is formed with an out of plane (vertical) orientation perpendicular to the substrate, structure B which has a single disclination loop and a 180° twist at the inner region of the photo-patterned ring ($r$ < $r_{in}$), structure C which has no discontinuities but a 360° twist in the inner region of the photo-patterned ring ($r$ < $r_{in}$) and structure D with 2 disclination loops. The LC director configuration for all 4 structures is simulated through finite element (FE) Q-tensor simulations and the optical transmission for each structure is simulated using a generalized beam propagation method.

Jezik:Angleški jezik
Ključne besede:soft matter physics, liquid crystals
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:FMF - Fakulteta za matematiko in fiziko
Leto izida:2020
Št. strani:Str. 4999-5008
Številčenje:Vol. 16, iss. 21
UDK:538.9
ISSN pri članku:1744-683X
DOI:10.1039/d0sm00308e Povezava se odpre v novem oknu
COBISS.SI-ID:25001731 Povezava se odpre v novem oknu
Število ogledov:226
Število prenosov:27
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
 
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Gradivo je del revije

Naslov:Soft matter
Založnik:Royal Society of Chemistry
ISSN:1744-683X
COBISS.SI-ID:19616551 Povezava se odpre v novem oknu

Gradivo je financirano iz projekta

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

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

Sekundarni jezik

Jezik:Slovenski jezik
Ključne besede:fizika mehke snovi, tekoči kristali

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