Experimental confirmation of negative phase change in negative index material planar samples

Vier, D.; Fredkin, D. R.; Simic, A.; Schultz, S.; Tanielian, Minas
June 2005
Applied Physics Letters;6/13/2005, Vol. 86 Issue 24, p241908
Academic Journal
We use far-field range measurements to determine and confirm the negative phase change through a planar negative index material as a function of frequency. The metamaterial is composed of wires and split ring resonators. At frequencies for which the surface impedance Z/Z0=1, we determine the index (n) from the measured phase change (relative to a vacuum) and via numerical simulation. In addition to confirming the simulated negative phase change at the frequency where n=-1, we find good agreement with prior Snell’s law measurements from n=-2.5 to -0.5. This illustrates that measuring the phase change of the transmitted signal can be a practical means of identifying the existence of negative index in planar test samples.


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