Gradient index metamaterial based on slot elements

Paul, Oliver; Reinhard, Benjamin; Krolla, Bernd; Beigang, René; Rahm, Marco
June 2010
Applied Physics Letters;6/14/2010, Vol. 96 Issue 24, p241110
Academic Journal
We present a gradient-index (GRIN) metamaterial based on an array of annular slots. The structure allows a large variation in the effective refractive index under normal-to-plane incidence and thus enables the construction of GRIN devices consisting of only a small number of functional layers. Using full-wave simulations, we demonstrate the annular slot concept by means of a three-unit-cell thin GRIN lens for the terahertz (THz) range. In the presented realizations, we achieved an index contrast of Δn=1.5 resulting in a highly refractive flat lens which is suitable for focusing THz radiation to a spot size smaller than the wavelength.


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