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dc.contributor.authorÖzbay, Ekmelen_US
dc.contributor.authorAydın, Korayen_US
dc.contributor.authorÖzkan, Goncaen_US
dc.contributor.authorBulu, İrfanen_US
dc.date.accessioned2016-02-08T11:46:35Z
dc.date.available2016-02-08T11:46:35Z
dc.date.issued2006en_US
dc.identifier.issn0272-9172
dc.identifier.urihttp://hdl.handle.net/11693/27173
dc.description.abstractWe report a true left-handed (LH) behavior and focusing in a composite metamaterial consisting of periodically arranged split ring resonator (SRR) and wire structures. The magnetic resonance of the SRR structure is demonstrated by comparing the transmission spectra of SRRs with that of closed SRRs. We confirmed experimentally that the effective plasma frequency of the LH material composed of SRRs and wires is lower than the plasma frequency of the wires. A well-defined left-handed transmission band with a peak value of -1.2 dB (-0.3 dB/cm) is obtained. We also report the transmission characteristics of a 2D composite metamaterial (CMM) structure in free space. At the frequencies where left-handed transmission takes place, we experimentally confirmed that the CMM structure has effective negative refractive index. Phase shift between consecutive numbers of layers of CMM is measured and phase velocity is shown to be negative at the relevant frequency range. Refractive index values obtained from the refraction experiments and the phase measurements are in good agreement and the experimental results agree extremely well with the theoretical calculations. By measuring the refracted electromagnetic (EM) waves from a LHM slab, we found an effective refractive index of -1.86. A 2D scanning transmission measurement technique was used to measure the intensity distribution of the electromagnetic (EM) waves that radiate from the point source. The flat lens behavior of a 2D CMM slab was demonstrated for two different point source distances of ds = 0.5λ and λ. The full width at half maximum of the focused beams is 0.36λ and 0.4λ, respectively, which are both below the diffraction limit. © 2006 Materials Research Society.en_US
dc.language.isoEnglishen_US
dc.source.titleMaterials Research Society Symposium Proceedings, Symposium J – Negative Index Materials – From Microwave to Opticalen_US
dc.subjectComposite materialsen_US
dc.subjectElectromagnetic wave diffractionen_US
dc.subjectLight transmissionen_US
dc.subjectPhase velocityen_US
dc.subjectResonatorsen_US
dc.subjectComposite metamaterial (CMM)en_US
dc.subjectMetamaterialsen_US
dc.subjectNegative refractionen_US
dc.subjectPlasma frequencyen_US
dc.subjectSplit ring resonator (SRR)en_US
dc.subjectRefractive indexen_US
dc.titleExperimental demonstration of negative refraction and subwavelength imaging by left-handed composite metamaterialsen_US
dc.typeConference Paperen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.citation.spage43en_US
dc.citation.epage54en_US
dc.citation.volumeNumber919en_US
dc.publisherCambridge University Pressen_US


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