Ultrathin phase-change coatings on metals for electrothermally tunable colors

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dc.citation.epage071109-5en_US
dc.citation.issueNumber7en_US
dc.citation.spage071109-1en_US
dc.citation.volumeNumber109en_US
dc.contributor.authorBakan, G.en_US
dc.contributor.authorAyas S.en_US
dc.contributor.authorSaidzoda, T.en_US
dc.contributor.authorCelebi, K.en_US
dc.contributor.authorDana, A.en_US
dc.date.accessioned2018-04-12T10:47:02Z
dc.date.available2018-04-12T10:47:02Z
dc.date.issued2016-08en_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractMetal surfaces coated with ultrathin lossy dielectrics enable color generation through strong interferences in the visible spectrum. Using a phase-change thin film as the coating layer offers tuning the generated color by crystallization or re-amorphization. Here, we study the optical response of surfaces consisting of thin (5-40 nm) phase-changing Ge2Sb2Te5 (GST) films on metal, primarily Al, layers. A color scale ranging from yellow to red to blue that is obtained using different thicknesses of as-deposited amorphous GST layers turns dim gray upon annealing-induced crystallization of the GST. Moreover, when a relatively thick (>100 nm) and lossless dielectric film is introduced between the GST and Al layers, optical cavity modes are observed, offering a rich color gamut at the expense of the angle independent optical response. Finally, a color pixel structure is proposed for ultrahigh resolution (pixel size: 5 × 5 μm2), non-volatile displays, where the metal layer acting like a mirror is used as a heater element. The electrothermal simulations of such a pixel structure suggest that crystallization and re-amorphization of the GST layer using electrical pulses are possible for electrothermal color tuning.en_US
dc.identifier.doi10.1063/1.4961368en_US
dc.identifier.issn0003-6951
dc.identifier.urihttp://hdl.handle.net/11693/36648
dc.language.isoEnglishen_US
dc.publisherAmerican Institute of Physics Inc.en_US
dc.relation.isversionofhttps://doi.org/10.1063/1.4961368en_US
dc.source.titleApplied Physics Lettersen_US
dc.subjectAluminumen_US
dc.subjectAmorphizationen_US
dc.subjectCoatingsen_US
dc.subjectDielectric filmsen_US
dc.subjectDielectric materialsen_US
dc.subjectMetalsen_US
dc.subjectPixelsen_US
dc.subjectThin filmsen_US
dc.subjectTuningen_US
dc.subjectAngle-independenten_US
dc.subjectElectro-thermal simulationen_US
dc.subjectInduced crystallizationen_US
dc.subjectLossless dielectricsen_US
dc.subjectLossy dielectricsen_US
dc.subjectPhase change thin filmsen_US
dc.subjectStrong interferenceen_US
dc.subjectUltrahigh resolutionen_US
dc.subjectColoren_US
dc.titleUltrathin phase-change coatings on metals for electrothermally tunable colorsen_US
dc.typeArticleen_US

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Institute of Materials Science and Nanotechnology (UNAM)