Performance enhancement of graphene based optoelectronic devices

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buir.advisorÖzbay, Ekmel
dc.contributor.authorÖzdemir, Onur
dc.date.accessioned2016-08-29T13:42:27Z
dc.date.available2016-08-29T13:42:27Z
dc.date.copyright2016-08
dc.date.issued2016-08
dc.date.submitted2016-08-18
dc.descriptionCataloged from PDF version of article.en_US
dc.descriptionThesis (M.S.): Bilkent University, Department of Electrical and Electronics Engineering, İhsan Doğramacı Bilkent University, 2016.en_US
dc.descriptionIncludes bibliographical references (leaves 49-56).en_US
dc.description.abstractGraphene is a strong candidate for active optoelectronic devices because of its electrostatically tunable optical response. Current substrate back-gating methods are unable to sustain high fields through graphene unless a high gate voltage is applied. In order to solve this problem, ionic liquid gating is used which allows substrate front side gating, thus eliminating major loss factors such as a dielectric layer and a thick substrate layer. On the other hand, due to its two dimensional nature, graphene interacts weakly with light and this interaction limits its efficiency in optoelectronic devices. However, V-shaped plasmonic antennas can be used to enhance the incident electric field intensity and confine the electric field near graphene thus allowing further interaction with graphene. Combining V-shaped nanoantennas with the tunable response of graphene, the operation wavelength of the devices that employ V-shaped antennas can be tuned in situ. We demonstrate a reflection enhancement by utilising different V-shaped nanoantenna geometries on a Si-SiO2 substrate. After studying the response of these nanoantennas, we demonstrate a graphene-based device with ionic liquid gating and V-shaped plasmonic antennas to both enhance and more effectively tune the total optical response. We are able to tune the transmission response of the device for up to 389 nm by changing the gate voltage by 3.8 Volts in the mid-infrared regime.en_US
dc.description.provenanceSubmitted by Betül Özen (ozen@bilkent.edu.tr) on 2016-08-29T13:42:27Z No. of bitstreams: 1 Onur - Thesis.pdf: 35944361 bytes, checksum: 99bed7d94c372257b4983b26490916e7 (MD5)en
dc.description.provenanceMade available in DSpace on 2016-08-29T13:42:27Z (GMT). No. of bitstreams: 1 Onur - Thesis.pdf: 35944361 bytes, checksum: 99bed7d94c372257b4983b26490916e7 (MD5) Previous issue date: 2016-08en
dc.description.statementofresponsibilityby Onur Özdemir.en_US
dc.embargo.release2018-08-02
dc.format.extentxiii, 56 leaves : illustrations, charts (some color)en_US
dc.identifier.itemidB153987
dc.identifier.urihttp://hdl.handle.net/11693/32185
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectGrapheneen_US
dc.subjectPlasmonicsen_US
dc.subjectNanoantennasen_US
dc.subjectIonic liquiden_US
dc.subjectPhotomodulationen_US
dc.titlePerformance enhancement of graphene based optoelectronic devicesen_US
dc.title.alternativeGrafen tabanlı optpelektronik aygıtlarda performans artırılmasıen_US
dc.typeThesisen_US
thesis.degree.disciplineElectrical and Electronic Engineering
thesis.degree.grantorBilkent University
thesis.degree.levelMaster's
thesis.degree.nameMS (Master of Science)

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