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dc.contributor.authorÖzbay, Ekmelen_US
dc.contributor.authorBulu, I.en_US
dc.contributor.authorAydin, K.en_US
dc.contributor.authorCaglayan H.en_US
dc.contributor.authorAlici, K. B.en_US
dc.contributor.authorGuven, K.en_US
dc.date.accessioned2016-02-08T11:52:01Z
dc.date.available2016-02-08T11:52:01Z
dc.date.issued2005en_US
dc.identifier.issn1054-660X
dc.identifier.urihttp://hdl.handle.net/11693/27388
dc.description.abstractIn this article, we present an experimental and numerical study of certain optical properties of two-dimensional dielectric photonic crystals (PCs). By modifying the band structure of a two-dimensional photonic crystal through its crystal parameters, we show how it is possible to confine the angular distribution of radiation from an embedded omnidirectional source. We then demonstrate that the anomalous band dispersions of PCs give rise to completely novel optical phenomena, in particular, the negative refraction of electromagnetic waves at the interface of a PC. We investigate the spectral negative refraction, which utilizes a transverse magnetic (TM)-polarized upper band of a PC, in detail and show that a high degree of isotropy can be achieved for the corresponding effective index of refraction. The presence of nearly a isotropic negative refractive index leads to focusing of omnidirectional sources by a PC slab lens, which can surpass certain limitations of conventional (positive refractive) lenses. These examples indicate the potential of PCs for photonics applications utilizing the band structure.en_US
dc.language.isoEnglishen_US
dc.source.titleLaser Physicsen_US
dc.subjectCrystalsen_US
dc.subjectDielectric materialsen_US
dc.subjectPermittivityen_US
dc.subjectPhotonsen_US
dc.subjectRadiation effectsen_US
dc.subjectRefractive indexen_US
dc.subjectSemiconducting aluminum compoundsen_US
dc.subjectWave propagationen_US
dc.subjectDirective radiationen_US
dc.subjectNegative refractionen_US
dc.subjectPhotonic crystals (PC)en_US
dc.subjectPhotonic devicesen_US
dc.subjectRefractionen_US
dc.titleHighly directive radiation and negative refraction using photonic crystalsen_US
dc.typeArticleen_US
dc.departmentDepartment of Physics
dc.departmentNanotechnology Research Center NANOTAMen_US
dc.departmentInstitute of Materials Science and Nanotechnology UNAMen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.citation.spage217en_US
dc.citation.epage224en_US
dc.citation.volumeNumber15en_US
dc.citation.issueNumber2en_US
dc.publisherInstitute of Physics Publishingen_US
dc.contributor.bilkentauthorÖzbay, Ekmelen_US
dc.identifier.eissn1555-6611


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