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dc.contributor.advisorDemir, Hilmi Volkan
dc.contributor.authorSoğancı, İbrahim Murat
dc.date.accessioned2016-01-08T18:01:27Z
dc.date.available2016-01-08T18:01:27Z
dc.date.issued2007
dc.identifier.urihttp://hdl.handle.net/11693/14530
dc.descriptionAnkara : The Department of Electrical and Electronics Engineering and the Institute of Engineering and Sciences of Bilkent University, 2007.en_US
dc.descriptionThesis (Master's) -- Bilkent University, 2007.en_US
dc.descriptionIncludes bibliographical references leaves 74-83en_US
dc.description.abstractQuantum confinement allows for the development of novel luminescent materials such as colloidal semiconductor quantum dots for a variety of photonic applications spanning from biomedical labeling to white light generation. However, such device applications require efficient photoluminescence. To this end, in this thesis we investigate the spontaneous emission characteristics of semiconductor nanocrystal emitters under different conditions and their enhancement and controlled modification via plasmonic resonance coupling, placing metallic nanoparticles in their proximity, for innovative device applications. We first present our theoretical and experimental work on the optical characterization of nanocyrstals (e.g., CdSe, CdS, and CdSe/ZnS) including absorption/photoluminescence, time-resolved luminescence, and excitation spectra measurements. Here we demonstrate very strong electromodulation (up to 90%) of photoluminescence and absorption of such nanocrystals (nanodots and nanorods) for optical modulator applications. Second, we present our electromagnetic modeling on the optical response of metal nanoparticles using finite-difference-time-domain method. For the first time, using localized plasmons of metal nanoisland films (nano-silver) carefully spectrally and spatially tuned for optimal coupling conditions, we report very significant controlled modifications of nanocrystal emission including the peak emission wavelength shift (by 14nm), emission linewidth reduction (by 10nm with 22% FWHM reduction), photoluminescence intensity enhancement (15.1- and 21.6-fold compared to the control groups of the same nanocrystals with no plasmonic coupling and those with identical nano-silver but no dielectric spacer in the case of non-radiative energy transfer, respectively), and selectable peaking of surface-state emission at desired wavelengths. Such localized plasmonic engineering of nanocrystal emitters opens new possibilities for our lightemitting and photovoltaic devices.en_US
dc.description.statementofresponsibilitySoğancı, İbrahim Muraten_US
dc.format.extentxiii, 83 leaves, tables, graphsen_US
dc.language.isoEnglishen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectQuantum confinementen_US
dc.subjectFDTDen_US
dc.subjectmetal-enhanced luminescenceen_US
dc.subjectlocalized plasmonsen_US
dc.subjectmetal nanoparticlesen_US
dc.subjectelectromodulationen_US
dc.subjectphotoluminescenceen_US
dc.subjectspontaneous emissionen_US
dc.subjectnanorodsen_US
dc.subjectnanocrystalsen_US
dc.subjectquantum dotsen_US
dc.subject.lccQC611 .S64 2007en_US
dc.subject.lcshSemiconductors.en_US
dc.subject.lcshQuantum electronics.en_US
dc.titleLocalized plasmon-coupled semiconductor nanocrystal emitters for innovative device applicationsen_US
dc.typeThesisen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.publisherBilkent Universityen_US
dc.description.degreeM.S.en_US


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