Fabrication of two-dimensional dimple and conical microlens arrays from a highly periodic toroidal-shaped liquid crystal defect array

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dc.contributor.authorKim, Yun-Hoko
dc.contributor.authorJeong, Hyeon-Suko
dc.contributor.authorKim, Jung-Hyunko
dc.contributor.authorYoon, Eun-Kyoungko
dc.contributor.authorYoon, Dong-Kiko
dc.contributor.authorJung, Hee-Taeko
dc.date.accessioned2013-03-11T01:39:22Z-
dc.date.available2013-03-11T01:39:22Z-
dc.date.created2012-02-06-
dc.date.created2012-02-06-
dc.date.issued2010-
dc.identifier.citationJOURNAL OF MATERIALS CHEMISTRY, v.20, no.31, pp.6557 - 6561-
dc.identifier.issn0959-9428-
dc.identifier.urihttp://hdl.handle.net/10203/97943-
dc.description.abstractA self-assembly fabrication method was developed for the preparation of microlens arrays (MLAs). The procedure used the focal conic structures of semi-fluorinated smectic liquid crystals (LCs), the periodic toric focal conic domains (TFCDs), which were prepared on a surface-modified substrate. This LC-based MLA system focuses light via the intrinsic molecular orientations of the TFCDs, leading to a highly efficient MLA with good optical properties. The thickness of the smectic LC film could be used to control both the microlens feature size, over the range 5-15 mu m, and the microlens focal length, over the range 1-3 mu m. In addition, we prepared two-dimensional hexagonally packed polymer MLAs with conical or dimple shapes by successive replica molding, using a UV-curable photopolymer (NOA63) and polydimethylsiloxane (PDMS), from a TFCD array template containing a dimple structure. The LC-based TFCD MLAs and the secondary replicated polymer MLAs, using NOA63 and PDMS molds, showed good lens performances. We anticipate that this LC self-assembly method will be applicable to the large-scale fabrication of MLAs. The method allows fabrication of dynamic MLAs that are responsive to external fields, such as electric or magnetic fields, or to thermal variations.-
dc.languageEnglish-
dc.publisherROYAL SOC CHEMISTRY-
dc.subjectPHASE-
dc.subjectPHOTOLITHOGRAPHY-
dc.subjectDOMAINS-
dc.subjectSYSTEM-
dc.titleFabrication of two-dimensional dimple and conical microlens arrays from a highly periodic toroidal-shaped liquid crystal defect array-
dc.typeArticle-
dc.identifier.wosid000280398300027-
dc.identifier.scopusid2-s2.0-77954978146-
dc.type.rimsART-
dc.citation.volume20-
dc.citation.issue31-
dc.citation.beginningpage6557-
dc.citation.endingpage6561-
dc.citation.publicationnameJOURNAL OF MATERIALS CHEMISTRY-
dc.identifier.doi10.1039/c0jm00910e-
dc.contributor.localauthorYoon, Dong-Ki-
dc.contributor.localauthorJung, Hee-Tae-
dc.type.journalArticleArticle-
dc.subject.keywordPlusPHASE-
dc.subject.keywordPlusPHOTOLITHOGRAPHY-
dc.subject.keywordPlusDOMAINS-
dc.subject.keywordPlusSYSTEM-
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