Complex liquid crystal superstructures induced by periodic photo-alignment at top and bottom substrates
The formation of nematic liquid crystal (LC) superstructures in cells with non-uniform photo-alignment at the confining substrates is studied experimentally and by simulations. An interference pattern of left- and right-handed circularly polarized light is used to define the alignment at both substr...
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| Veröffentlicht in: | Soft matter 2018, Vol.14 (33), p.6892-692 |
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| creator | Nys, Inge Nersesyan, Varsenik Beeckman, Jeroen Neyts, Kristiaan |
| description | The formation of nematic liquid crystal (LC) superstructures in cells with non-uniform photo-alignment at the confining substrates is studied experimentally and by simulations. An interference pattern of left- and right-handed circularly polarized light is used to define the alignment at both substrates separately, so that the alignment varies along the
x
-coordinate on one substrate and along the
y
-coordinate on the other substrate. The interplay between the complex surface alignment and the liquid crystalline soft matter leads to the formation of interesting 3D configurations. The periodic LC structures that are formed in the bulk of the cell are analyzed experimentally by polarizing optical microscopy (POM) for different applied voltages. In the region with strong photo-alignment at both substrates, a 2D LC polarization grating (PG) with a complex 3D director configuration is formed. Distinct periodic structures with different symmetry properties are observed in the regions with weak illumination at the top and/or bottom substrate. The director configuration in the different regions was successfully simulated with the help of finite element (FE)
Q
-tensor simulations. The agreement between the simulations and the experiments was verified by comparing the POM images with simulated results for the transmission between crossed polarizers.
Complex liquid crystal superstructures in a cell with non-uniform surface anchoring are studied experimentally and by simulations. |
| doi_str_mv | 10.1039/c8sm01145a |
| format | Article |
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x
-coordinate on one substrate and along the
y
-coordinate on the other substrate. The interplay between the complex surface alignment and the liquid crystalline soft matter leads to the formation of interesting 3D configurations. The periodic LC structures that are formed in the bulk of the cell are analyzed experimentally by polarizing optical microscopy (POM) for different applied voltages. In the region with strong photo-alignment at both substrates, a 2D LC polarization grating (PG) with a complex 3D director configuration is formed. Distinct periodic structures with different symmetry properties are observed in the regions with weak illumination at the top and/or bottom substrate. The director configuration in the different regions was successfully simulated with the help of finite element (FE)
Q
-tensor simulations. The agreement between the simulations and the experiments was verified by comparing the POM images with simulated results for the transmission between crossed polarizers.
Complex liquid crystal superstructures in a cell with non-uniform surface anchoring are studied experimentally and by simulations.</description><identifier>ISSN: 1744-683X</identifier><identifier>EISSN: 1744-6848</identifier><identifier>DOI: 10.1039/c8sm01145a</identifier><identifier>PMID: 30091777</identifier><language>eng</language><publisher>England: Royal Society of Chemistry</publisher><subject>Alignment ; Circular polarization ; Configurations ; Confining ; Finite element method ; Handedness ; Image transmission ; Liquid crystals ; Microscopy ; Nematic crystals ; Optical microscopy ; Periodic structures ; Polarized light ; Polarizers ; Simulation ; Substrates ; Superstructures</subject><ispartof>Soft matter, 2018, Vol.14 (33), p.6892-692</ispartof><rights>Copyright Royal Society of Chemistry 2018</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c374t-5d6680d7c3740b058b07abf6fd33279f50d443f91b53b0997ad88e22cb049a423</citedby><cites>FETCH-LOGICAL-c374t-5d6680d7c3740b058b07abf6fd33279f50d443f91b53b0997ad88e22cb049a423</cites><orcidid>0000-0001-5551-9772 ; 0000-0001-8191-8128 ; 0000-0002-0711-2465</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780,4009,27902,27903,27904</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/30091777$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Nys, Inge</creatorcontrib><creatorcontrib>Nersesyan, Varsenik</creatorcontrib><creatorcontrib>Beeckman, Jeroen</creatorcontrib><creatorcontrib>Neyts, Kristiaan</creatorcontrib><title>Complex liquid crystal superstructures induced by periodic photo-alignment at top and bottom substrates</title><title>Soft matter</title><addtitle>Soft Matter</addtitle><description>The formation of nematic liquid crystal (LC) superstructures in cells with non-uniform photo-alignment at the confining substrates is studied experimentally and by simulations. An interference pattern of left- and right-handed circularly polarized light is used to define the alignment at both substrates separately, so that the alignment varies along the
x
-coordinate on one substrate and along the
y
-coordinate on the other substrate. The interplay between the complex surface alignment and the liquid crystalline soft matter leads to the formation of interesting 3D configurations. The periodic LC structures that are formed in the bulk of the cell are analyzed experimentally by polarizing optical microscopy (POM) for different applied voltages. In the region with strong photo-alignment at both substrates, a 2D LC polarization grating (PG) with a complex 3D director configuration is formed. Distinct periodic structures with different symmetry properties are observed in the regions with weak illumination at the top and/or bottom substrate. The director configuration in the different regions was successfully simulated with the help of finite element (FE)
Q
-tensor simulations. The agreement between the simulations and the experiments was verified by comparing the POM images with simulated results for the transmission between crossed polarizers.
Complex liquid crystal superstructures in a cell with non-uniform surface anchoring are studied experimentally and by simulations.</description><subject>Alignment</subject><subject>Circular polarization</subject><subject>Configurations</subject><subject>Confining</subject><subject>Finite element method</subject><subject>Handedness</subject><subject>Image transmission</subject><subject>Liquid crystals</subject><subject>Microscopy</subject><subject>Nematic crystals</subject><subject>Optical microscopy</subject><subject>Periodic structures</subject><subject>Polarized light</subject><subject>Polarizers</subject><subject>Simulation</subject><subject>Substrates</subject><subject>Superstructures</subject><issn>1744-683X</issn><issn>1744-6848</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNpd0ctLHTEUBvBQKvVRN91bAt2UwtiTSWaSLC-X1gqKCy24G_IaHZmZjHmA97839toruErC-fERvoPQFwKnBKj8aUScgBDWqA_ogHDGqlYw8XF3p7f76DDGBwAqGGk_oX0KIAnn_ADdrf20jO4Jj8NjHiw2YROTGnHMiwsxhWxSDi7iYbbZOIv1BpfB4O1g8HLvk6_UONzNk5sTVgknv2A1F-ZT8lNJ0SVDJRc_o71ejdEdv55H6O_vXzfrP9XF1dn5enVRGcpZqhrbtgIsf3mBhkZo4Er3bW8prbnsG7CM0V4S3VANUnJlhXB1bTQwqVhNj9D3be4S_GN2MXXTEI0bRzU7n2NXg2jrtqZ1W-i3d_TB5zCX3xUlCQEJDSnqx1aZ4GMMru-WMEwqbDoC3Uv93VpcX_6rf1Xw19fIrCdnd_R_3wWcbEGIZjd92x99BnGCiqU</recordid><startdate>2018</startdate><enddate>2018</enddate><creator>Nys, Inge</creator><creator>Nersesyan, Varsenik</creator><creator>Beeckman, Jeroen</creator><creator>Neyts, Kristiaan</creator><general>Royal Society of Chemistry</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QO</scope><scope>7QQ</scope><scope>7SC</scope><scope>7SE</scope><scope>7SP</scope><scope>7SR</scope><scope>7TA</scope><scope>7TB</scope><scope>7U5</scope><scope>8BQ</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>H8D</scope><scope>H8G</scope><scope>JG9</scope><scope>JQ2</scope><scope>KR7</scope><scope>L7M</scope><scope>L~C</scope><scope>L~D</scope><scope>P64</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-5551-9772</orcidid><orcidid>https://orcid.org/0000-0001-8191-8128</orcidid><orcidid>https://orcid.org/0000-0002-0711-2465</orcidid></search><sort><creationdate>2018</creationdate><title>Complex liquid crystal superstructures induced by periodic photo-alignment at top and bottom substrates</title><author>Nys, Inge ; 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An interference pattern of left- and right-handed circularly polarized light is used to define the alignment at both substrates separately, so that the alignment varies along the
x
-coordinate on one substrate and along the
y
-coordinate on the other substrate. The interplay between the complex surface alignment and the liquid crystalline soft matter leads to the formation of interesting 3D configurations. The periodic LC structures that are formed in the bulk of the cell are analyzed experimentally by polarizing optical microscopy (POM) for different applied voltages. In the region with strong photo-alignment at both substrates, a 2D LC polarization grating (PG) with a complex 3D director configuration is formed. Distinct periodic structures with different symmetry properties are observed in the regions with weak illumination at the top and/or bottom substrate. The director configuration in the different regions was successfully simulated with the help of finite element (FE)
Q
-tensor simulations. The agreement between the simulations and the experiments was verified by comparing the POM images with simulated results for the transmission between crossed polarizers.
Complex liquid crystal superstructures in a cell with non-uniform surface anchoring are studied experimentally and by simulations.</abstract><cop>England</cop><pub>Royal Society of Chemistry</pub><pmid>30091777</pmid><doi>10.1039/c8sm01145a</doi><tpages>11</tpages><orcidid>https://orcid.org/0000-0001-5551-9772</orcidid><orcidid>https://orcid.org/0000-0001-8191-8128</orcidid><orcidid>https://orcid.org/0000-0002-0711-2465</orcidid></addata></record> |
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| source | Royal Society Of Chemistry Journals 2008-; Alma/SFX Local Collection |
| subjects | Alignment Circular polarization Configurations Confining Finite element method Handedness Image transmission Liquid crystals Microscopy Nematic crystals Optical microscopy Periodic structures Polarized light Polarizers Simulation Substrates Superstructures |
| title | Complex liquid crystal superstructures induced by periodic photo-alignment at top and bottom substrates |
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