FIGURE 2. SEM image of NIM prism and schematics of experimental setup.
From the following article:
Three-dimensional optical metamaterial with a negative refractive index
Jason Valentine, Shuang Zhang, Thomas Zentgraf, Erick Ulin-Avila, Dentcho A. Genov, Guy Bartal & Xiang Zhang
Nature 455, 376-379(18 September 2008)
doi:10.1038/nature07247
a, SEM image of the fabricated 3D fishnet NIM prism. The unit cell size is identical to that shown in Fig. 1a. The inset shows a magnified view with the film layers visible in each hole. b, Geometry diagram of the angle measurement; 
corresponds to the position difference of the beam passing through a window in the multilayer structure (n = 1) and prism sample. By measuring , the absolute angle of refraction 
can be obtained. c, Experimental setup for the beam refraction measurement. The focal length of lens 1 is 50 mm and that of lens 2 is f2 = 40 mm. Lens 2 is placed in a 2f configuration, resulting in the Fourier image at the camera position.
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