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(Color online) (a) Ray optics scheme explaining the generation of a highly directional beam by -space filtering using an impedance-matched metamaterial slab with negative small ; (b) as (a) but for the case of an impedance-mismatched slab.
(Color online) 2D FDTD simulations: (a) Electric field distribution on the plane and (b) square electric field along the direction in the position of the focus obtained with a PhC slab with , (c) Intensity distribution obtained with the PhC slab used in the experiments (ten layers).
(Color online) Detected power normalized with respect to the power detected when no PhC slab is present as a function of the frequency and the angle (a), (b), and (c) represent results for a thickness of ten layers and , 75, and , respectively; (d), (e), and (f) represent results for a thickness of five layers and , 75, and , respectively.
(Color online) Detected power normalized with respect to the power detected at as a function of the frequency and the angle for a thickness of ten layers . From left to right, , 75, and .
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