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      Negative refraction and subwavelength focusing using photonic crystals

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      Author
      Özbay, Ekmel
      Aydın, Koray
      Alıcı, Kamil Boratay
      Güven, Kaan
      Date
      2005-01
      Source Title
      Proceedings of SPIE - Integrated Optoelectronic Devices 2005 - Photonic Crystal Materials and Devices III
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Volume
      5733
      Pages
      39 - 49
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
      241
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      205
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      Abstract
      We review certain novel optical properties of two-dimensional dielectric photonic crystals (PCs) which exhibit negative refraction behavior. We investigate two mechanisms which utilize the band structure of the PC and lead to a negative effective index of refraction (neff < 0). The negative refraction phenomenon is demonstrated experimentally and by simulations when the incident beam couples to a photonic band with neff < 0. Further, the PC slab acts like a focusing lens to an omnidirectional source where the properties of focusing depends on the details of the band structure. In one case, by utilizing the TM polarized first band, an image of the source can be formed in the vicinity of the interface with subwavelength resolution. In another case, a TE polarized upper band is used which is able to focus the omnidirectional field far away from the interface with a resolution on par with the wavelength. In the latter case, we explicitly show the flat lens behavior of the structure. These examples indicate that PC based lenses can surpass limitations of conventional lenses and greatly enhance and extend optics applications.
      Keywords
      Negative refraction
      Photonic crystal
      Subwavelength resolution
      Dielectric materials
      Lenses
      Light polarization
      Light propagation
      Light refraction
      Optical resolving power
      Permittivity
      Photons
      Refractive index
      Negative refraction
      Photonic bandgap
      Photonic crystal
      Subwavelength resolution
      Crystals
      Permalink
      http://hdl.handle.net/11693/27380
      Published Version (Please cite this version)
      https://doi.org/10.1117/12.582778
      Collections
      • Advanced Research Laboratories (ARL) 34
      • Department of Electrical and Electronics Engineering 3613
      • Department of Physics 2345
      • Institute of Materials Science and Nanotechnology (UNAM) 1858
      • Nanotechnology Research Center (NANOTAM) 1038
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