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      Highly directive radiation and negative refraction using photonic crystals

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      Author
      Özbay, Ekmel
      Bulu, I.
      Aydin, K.
      Caglayan H.
      Alici, K. B.
      Guven, K.
      Date
      2005
      Source Title
      Laser Physics
      Print ISSN
      1054-660X
      Electronic ISSN
      1555-6611
      Publisher
      Institute of Physics Publishing
      Volume
      15
      Issue
      2
      Pages
      217 - 224
      Language
      English
      Type
      Article
      Item Usage Stats
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      Abstract
      In 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.
      Keywords
      Crystals
      Dielectric materials
      Permittivity
      Photons
      Radiation effects
      Refractive index
      Semiconducting aluminum compounds
      Wave propagation
      Directive radiation
      Negative refraction
      Photonic crystals (PC)
      Photonic devices
      Refraction
      Permalink
      http://hdl.handle.net/11693/27388
      Collections
      • Department of Electrical and Electronics Engineering 3524
      • Department of Physics 2299
      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      • Nanotechnology Research Center (NANOTAM) 1006
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