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Experimental and numerical studies of terahertz surface waves on a thin metamaterial film

: Reinhard, B.; Paul, O.; Beigang, R.; Rahm, M.


Optics Letters 35 (2010), Nr.9, S.1320-1322
ISSN: 0146-9592
Fraunhofer IPM ()
terahertz surface waves; metamaterial

We present experimental and numerical studies of localized terahertz surface waves on a subwavelength-thick metamaterial film consisting of in-plane split-ring resonators. A simple and intuitive model is derived that describes the propagation of surface waves as guided modes in a waveguide filled with a Lorentz-like medium. The effective medium model allows us to deduce the dispersion relation of the surface waves, in excellent agreement with the numerical data obtained from 3D full-wave calculations. Both the accuracy of the analytical model and the numerical calculations are confirmed by spectroscopic terahertz time-domain measurements.