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      Observation of negative refraction and negative phase velocity in true left-handed metamaterials

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      Author
      Özbay, Ekmel
      Date
      2005
      Source Title
      Proceedings of SPIE, Metamaterials
      Print ISSN
      0277-786X
      Publisher
      SPIE
      Volume
      5955
      Pages
      595502-1 - 595502-9
      Language
      English
      Type
      Conference Paper
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      Abstract
      We report a true left-handed (LH) behavior 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. The experimental results agree extremely well with the theoretical calculations.
      Keywords
      Left-handed medium
      Metamaterial
      Negative phase velocity
      Negative refraction
      Split ring resonator
      Composite structures
      Light velocity
      Optical resonators
      Refractive index
      Left-handed medium
      Metamaterial
      Negative phase velocity
      Negative refraction
      Split ring resonators
      Materials
      Permalink
      http://hdl.handle.net/11693/27370
      Published Version (Please cite this version)
      http://dx.doi.org/10.1117/12.620264
      Collections
      • Department of Physics 2365
      • Institute of Materials Science and Nanotechnology (UNAM) 1874
      • Nanotechnology Research Center (NANOTAM) 1043
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