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      Experimental demonstration of negative refraction and subwavelength imaging by left-handed composite metamaterials

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      Author
      Özbay, Ekmel
      Aydın, Koray
      Özkan, Gonca
      Bulu, İrfan
      Date
      2006
      Source Title
      Materials Research Society Symposium Proceedings, Symposium J – Negative Index Materials – From Microwave to Optical
      Print ISSN
      0272-9172
      Publisher
      Cambridge University Press
      Volume
      919
      Pages
      43 - 54
      Language
      English
      Type
      Conference Paper
      Item Usage Stats
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      Abstract
      We 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.
      Keywords
      Composite materials
      Electromagnetic wave diffraction
      Light transmission
      Phase velocity
      Resonators
      Composite metamaterial (CMM)
      Metamaterials
      Negative refraction
      Plasma frequency
      Split ring resonator (SRR)
      Refractive index
      Permalink
      http://hdl.handle.net/11693/27173
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      • Institute of Materials Science and Nanotechnology (UNAM) 1775
      • Work in Progress 352
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