Measurements of the negative refractive index of sub-diffraction waves propagating in an indefinite permittivity medium.

@article{Korobkin2010MeasurementsOT,
  title={Measurements of the negative refractive index of sub-diffraction waves propagating in an indefinite permittivity medium.},
  author={D. Korobkin and B. Neuner and Chris R Fietz and N. Jegeny{\'e}s and G. Ferro and G. Shvets},
  journal={Optics express},
  year={2010},
  volume={18 22},
  pages={
          22734-46
        }
}
An indefinite permittivity medium (IPM) has been fabricated and optically characterized in mid-infrared spectral range (10.7 µm-11.3 µm). Phase and amplitude transmission measurements reveal two remarkable properties of IPMs: (i) transmission of sub-diffraction waves (as short as λ/4) can exceed those of diffraction-limited ones, and (ii) sub-diffraction waves can propagate with negative refractive index. We describe a novel double-detector optical technique relying on the interference between… Expand
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