Characterization and applications of negative-index metamaterials

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buir.advisorÖzbay, Ekmel
dc.contributor.authorAydın, Koray
dc.date.accessioned2016-01-08T18:05:44Z
dc.date.available2016-01-08T18:05:44Z
dc.date.issued2008
dc.departmentDepartment of Physicsen_US
dc.descriptionAnkara : The Department of Physics and the Institute of Engineering and Science of Bilkent University, 2008.en_US
dc.descriptionThesis (Ph.D.) -- Bilkent University, 2008.en_US
dc.descriptionIncludes bibliographical references leaves 103-113.en_US
dc.description.abstractMetamaterials offer novel electromagnetic properties and promising applications including negative refraction, flat-lenses, superlenses, cloaking devices. In this thesis, we characterized the negative-index metamaterials that is composed of periodic arrangements of split-ring resonators (providing negative permeability) and thin wire (providing negative permittivity) arrays. The resonances of split-ring resonators (SRR) are investigated experimentally and theoretically. By combining SRR and wire arrays together, we observed a transmission band where both permittivity and permeability are simultaneously negative, indicating a left-handed behavior. Reflection measurements reveal that the impedance is matched to the free space at a certain frequency range. The lefthanded metamaterial is also shown to exhibit negative refractive index by using three different experimental methods namely, refraction from a wedge-shaped negative-index metamaterial (NIM), beam-shift from a slab-shaped NIM and phase shift from NIMs with different lengths. Flat-lens behavior is observed from a slabshaped negative-index metamaterial based microwave lenses. Furthermore, we demonstrated subwavelength imaging and subwavelength resolution by using thin superlenses constructed from SRR-wire arrays with an effective negative index. We have been able to image a point source with a record-level, λ/8 resolution. SRRand wire arrays exhibit negative index provided that the wave propagates parallel to the plane of SRR structure which makes it hard to fabricate at higher frequencies. An alternative structure called fishnet metamaterial however could yield negative index with wave propagation normal to the structure. We observed left-handed transmission and negative phase velocity in fishnet type metamaterials. Finally, we studied enhanced transmission from a single subwavelength aperture by coupling incident electromagnetic wave to a single SRR placed at the near-field of the aperture.en_US
dc.description.degreePh.D.en_US
dc.description.statementofresponsibilityAydın, Korayen_US
dc.format.extentxviii, 118 leavesen_US
dc.identifier.urihttp://hdl.handle.net/11693/14717
dc.language.isoEnglishen_US
dc.publisherBilkent Universityen_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectMetamaterialen_US
dc.subjectEnhanced Transmissionen_US
dc.subjectSubwavelength Resolutionen_US
dc.subjectSubwavelength Imagingen_US
dc.subjectSuperlensen_US
dc.subjectFlat-lensen_US
dc.subjectNegative-Phase Velocityen_US
dc.subjectNegative Refractionen_US
dc.subjectNegative Permeabilityen_US
dc.subjectNegative Permittivityen_US
dc.subjectSplit Ring Resonatoren_US
dc.subjectLeft-Handed Materialen_US
dc.subject.lccTK454.4.M3 A933 2008en_US
dc.subject.lcshMetamaterials.en_US
dc.subject.lcshRefraction (Optics)en_US
dc.titleCharacterization and applications of negative-index metamaterialsen_US
dc.typeThesisen_US

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