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Using coordinate transformation, we study the design of optical devices using metamaterials at infrared wavelength. We demonstrate that the design is enabled by composite metamaterials that realize the space coordinate transformation and allow a control of the light in waveguide configuration. We present the design and the simulation of a waveguide taper and of the metamaterials necessary to its realization.  Numerical simulations together with experimental measurements are performed in order to validate the concept of the device and the realization of the metamaterials. FTIR measurements performed on fabricated metamaterials agree qualitatively with Finite Element Method (FEM) simulations. It is shown that this strategy, using the particular properties of the infrared metamaterials, allows a precise control of the light propagation with a low level of loss.

metamaterials; plasmonics; transformation optics