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Simulation and experimental results. (a) Geometric optics (Ray tracing) (b) Experimental results at 650 GHz, (c) Physical Optics at 650 GHz, (d) Physical Optics at 275 GHz. Rows correspond to (i) −0.5 mm, (ii) 0 mm, and (iii) 0.5 mm axial displacements of the reference reflector. The outlined images in each column set indicate the template image located at (0, 0, 0).
