| fullrecord |
[{"key": "dc.contributor.advisor", "value": "Pettersson, Mika", "language": "", "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Akkanen, Suvi-Tuuli", "language": "", "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2019-12-12T08:11:40Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2019-12-12T08:11:40Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2019", "language": "", "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/66763", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Grafeenin plasmoneiden aikaansaamiseksi t\u00e4ytyy jollakin tavoin poistaa viritt\u00e4v\u00e4n valon fotonien liikem\u00e4\u00e4r\u00e4n ja grafeenin plasmoneiden aaltovektorin liikem\u00e4\u00e4r\u00e4n v\u00e4linen suuri ero. T\u00e4m\u00e4n tutkielman tarkoituksena oli saada aikaan grafeenin plasmoneita hy\u00f6dynt\u00e4m\u00e4ll\u00e4 optisella taonnalla tehtyjen rengasrakenteiden aallonpituutta pienempi\u00e4 piirteit\u00e4, joiden pit\u00e4isi teoreettisesti ratkaista t\u00e4m\u00e4 liikem\u00e4\u00e4r\u00e4ongelma. Optisella taonnalla voidaan muodostaa 3Dkuvioita 2D materiaaliin k\u00e4ytt\u00e4en hyv\u00e4ksi ultranopeiden laserpulssien aiheuttamaa j\u00e4nnitett\u00e4 2D materiaalin rakenteessa. 2D materiaali pyrkii purkamaan t\u00e4t\u00e4 j\u00e4nnitett\u00e4 venytt\u00e4m\u00e4ll\u00e4 ja taivuttamalla sidoksiaan ja muodostamalla pistem\u00e4isi\u00e4 hilavirheit\u00e4 rakenteeseensa, muodostaen 3D rakenteet. Vaikka optisen taonnan taustalla onkin osittain pistem\u00e4isten virheiden muodostuminen materiaalin hilaan, ovat materiaalin tyypilliset rakenteet silti hallitsevia ja s\u00e4ilytt\u00e4v\u00e4t materiaalin, t\u00e4ss\u00e4 tapauksessa grafeenin, elektroniset ominaisuudet. Lis\u00e4ksi suurempia, nanokaistaleita muistuttavia hilarakenteita kuvioitiin optisella taonnalla grafeeniin, sill\u00e4 nanokaistaleiden tutkimuksissa on aiemmin onnistuttu havaitsemaan plasmoneita samanlaisin mittausmenetelmin, kuin mit\u00e4 t\u00e4ss\u00e4 ty\u00f6ss\u00e4 hy\u00f6dynnet\u00e4\u00e4n. Plasmoneita yritettiin havaita mittaamalla kuvioiduista alueista infrapuna-absorption muutoksia, sill\u00e4 plasmoneiden oletettiin olevan kaukoinfrapuna- tai terahertsi- alueella. Koska infrapuna-absorptiossa ei havaittu muutoksia, vaikka erilaisia rakenteita ja mittauksia yritettiin, johtop\u00e4\u00e4t\u00f6ksen\u00e4 esitet\u00e4\u00e4n, etteiv\u00e4t optisesti taotut kuviot ole v\u00e4ltt\u00e4m\u00e4tt\u00e4 riitt\u00e4vi\u00e4 liikem\u00e4\u00e4r\u00e4eron poistamiseen ja t\u00e4ten plasmonien synnyn mahdollistamiseen. On my\u00f6s mahdollista ettei plasmoneita havaittu, koska ne olivat kauempana terahertsi- alueella kuin mihin laitteen mittausalue ylt\u00e4\u00e4, tai laitteen infrapunal\u00e4hteen signaali n\u00e4ytteest\u00e4 ei ollut riitt\u00e4v\u00e4 havaitsemaan plasmonien aiheuttamia muutoksia absorptiossa. Varmistuksen t\u00e4m\u00e4n tutkielman tulokselle voisi saada sulkemalla edell\u00e4 mainitut tekij\u00e4t pois esimerkiksi mittaamalla samoja asioita asian mukaisen aallonpituusalueen omaavan SNOM:in avulla tai kuvioimalla entist\u00e4 suurempia optisesti taottuja alueita, jolloin FTIR mittausten signaalia saataisiin parannettua.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "The goal of this thesis is to use the sub-wavelength features of optically forged blister structures to overcome the large mismatch between the wave vector of the incident light and the wave vector of graphene plasmons. Optical forging is a method where 3D patterns can be irradiated into 2D materials via ultra-short laser pulse introduced strain, which the material tries to overcome by bending, stretching bonds and creating point defects in the structure. Even though these optically forged structures in graphene have point defects, their overall structure is still graphene and thus they should exhibit largely the same electrical properties and be able to support GSPs. Larger structures that resemble\ngraphene nanoribbons were also forged and tested for plasmonic resonances. The plasmon measurements were done with FTIR microscope as plasmons change the light absorption. Possible GSPs were expected to be in the FIR or THz range. As no change in the IR response was detected between unpatterned and patterned areas despite multiple attempts with different structures and parameters, it could be that optically forged structures are not enough to overcome the wavevector mismatch and allow excitation of \nplasmons in graphene. The plasmons could also be further in the THz region and thus not visible in the measurements or the FTIR laser signal could have been insufficient for any plasmonic response to be detectable. To overrule these possible sources of error, larger structures which allow larger apertures and thus better signal for measurements, or SNOM with sufficient measurement range could be used to perform similar experiments.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by Paivi Vuorio (paelvuor@jyu.fi) on 2019-12-12T08:11:40Z\nNo. of bitstreams: 0", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2019-12-12T08:11:40Z (GMT). No. of bitstreams: 0\n Previous issue date: 2019", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "96", "language": "", "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "eng", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "plasmons", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "graphene plasmons", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "optical forging", "language": "", "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Graphene plasmons in optically forged structures", "language": "", "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201912125225", "language": "", "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Kemian laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Chemistry", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Fysikaalinen kemia", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Physical Chemistry", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": "", "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": null, "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4032", "language": "", "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "grafeeni", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "optiset ominaisuudet", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "laskentamenetelm\u00e4t", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "materiaalitiede", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "graphene", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "optical properties", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "calculation methods", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.subject.yso", "value": "materials science", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
|