High-quality alignment of nematic liquid crystals using periodic nanostructures created by nonlinear laser lithography

Simple item page
dc.citation.epage221en_US
dc.citation.spage212en_US
dc.citation.volumeNumber267en_US
dc.contributor.authorPavlov, I. A.en_US
dc.contributor.authorRybak, A. S.en_US
dc.contributor.authorDobrovolskiy, A. M.en_US
dc.contributor.authorKadan, V. M.en_US
dc.contributor.authorBlonskiy, I. V.en_US
dc.contributor.authorKazantseva, Z. I.en_US
dc.contributor.authorGvozdovskyy, I. A.en_US
dc.date.accessioned2019-02-21T16:01:50Z
dc.date.available2019-02-21T16:01:50Z
dc.date.issued2018en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractIt is well known that today two main and well studied methods for alignment of liquid crystals has been used, namely: rubbing and photoalignment technologies, that lead to the change of anisotropic properties of aligning layers and long-range interaction of the liquid crystal molecules in a mesophase. In this manuscript, we use the nonlinear laser lithography technique, which was recently presented as a fast, relatively low-cost method for a large area micro and nanogrooves fabrication based on laser-induced periodic surface structuring, as a new perspective method of the alignment of nematic liquid crystals. 920 nm periodic grooves were formed on a Ti layer processed by means of the nonlinear laser lithography and studied as an aligning layer. Aligning properties of the periodic structures of Ti layers were examined by using a combined twist LC cell. In addition, the layer of the nanostructured Ti was coated with an oxidianiline-polyimide film with annealing of the polymer film followed without any further processing. The dependence of the twist angle of LC cells on a scanning speed and power of laser beam during processing of the Ti layer was studied. The azimuthal anchoring energy of Ti layers with a periodic nanostructure was calculated. The maximum azimuthal anchoring energy for the nanostructured Ti layer was about 4.6 × 10−6 J/m2, which is comparable to the photoalignment technology. It was found that after the deposition of a polyimide film on the periodic nanostructured Ti layer, the gain effect of the azimuthal anchoring energy to ~1 × 10−4 J/m2 is observed. Also, AFM study of aligning surfaces was carried out.
dc.description.sponsorshipThe authors thank W. Becker (Merck, Darmstadt, Germany) for his generous gift of the nematic liquid crystal E7, Prof. I. Gerus (Institute of Bio-organic Chemistry and Petrochemistry, NAS of Ukraine) for the kind provision of the ODAPI polymer, Prof. O. Lavrentovich and Dr. B. Li (Kent State University, USA) for their gift of the polyimide PI2555 (HD MicroSystems, USA), Dr. P. Lytvyn and Dr. A. Korchovyi (V.E. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine) for their help during AFM studies and Dr. S. Lukyanets (Institute of Physics, NAS of Ukraine) for the helpful discussions. I.P. thanks M. Gure and E. Karaman (Bilkent University, Turkey) for the technical support of the NLL method. I.P. acknowledges financial support from European Research Council (ERC) Consolidator, Grant “Nonlinear Laser Lithography”, No: ERC- 617521 NLL .
dc.embargo.release2020-10-01en_US
dc.identifier.doi10.1016/j.molliq.2018.02.058
dc.identifier.issn0167-7322
dc.identifier.urihttp://hdl.handle.net/11693/49925
dc.language.isoEnglish
dc.publisherElsevier B.V.
dc.relation.isversionofhttps://doi.org/10.1016/j.molliq.2018.02.058
dc.relation.projectAdvanced Foods and Materials Canada, AFM - Bilkent Üniversitesi - European Research Council, ERC: ERC- 617521 - Kent State University, KSU
dc.source.titleJournal of Molecular Liquidsen_US
dc.subjectAligning layersen_US
dc.subjectAzimuthal anchoring energyen_US
dc.subjectNanostructured titanium layersen_US
dc.subjectNematic liquid crystalsen_US
dc.subjectNonlinear laser lithographyen_US
dc.subjectPolyimideen_US
dc.titleHigh-quality alignment of nematic liquid crystals using periodic nanostructures created by nonlinear laser lithographyen_US
dc.typeArticleen_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
High-quality_alignment_of_nematic_liquid_crystals_using_periodic_nanostructures_created_by_nonlinear_laser_lithography.pdf
Size:
2.6 MB
Format:
Adobe Portable Document Format
Description:
Full printable version
Download
Collections
Department of Physics