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Schematic of the wedge-type devices: (a) one unit cell and (b) ten layers prism. Simulation of electric field mapping for a ten-stair prism at (a) 0.46 THz and (d) 0.49 THz.
Transmission modulus as a function of the refracted beam angle for a prism with ten stacked hole arrays.
Photograph of the prism structure device (a) and of an optical microscope zoomed view of the prism with ten stacked hole arrays (b).
Schematic of the goniometric setup with the illustration of the optical and THz pulses in red and blue, respectively, and of the Si lenses in detection and emission (unscaled in this schematic).
Frequency dependence of the effective refractive index deduced from experiment and compared to the variations calculated for slab- and prism-devices.
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