FIGURE 3. Experimental results and finite-difference time-domain simulations.

a, Fourier-plane images of the beam for the window and prism sample for various wavelengths. The horizontal axis corresponds to the beam shift , and positions of n = 1 and n = 0 are denoted by the white lines. The image intensity for each wavelength has been normalized for clarity. b, Measurements and simulation of the fishnet refractive index. The circles show the results of the experimental measurement with error bars (s.d., n = 4 measurements). The measurement agrees closely with the simulated refractive index using the RCWA method (black line). c, Left: simulation of the in-plane electric field component for the prism structure at 1,763 nm, showing the phase front of the light. Negative-phase propagation resulting from the negative refractive index leads to negative refraction angle as measured by the beam shift in the experiment. Right: magnified plot of the field distribution in the prism.

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