Figure 5.

(a) The exemplary object used in simulations for 0.3 THz. (b) The image obtained in $4f$ imaging setup assuming no aperture, only calculation matrix size. (c) The image obtained in $4f$ imaging setup assuming lens apertures limited to 75 mm (marked with red dashed line) (d) The image obtained in $4f$ imaging setup assuming lens apertures limited to 50 mm (marked with red dashed line). Formed images are inverted as in $4f$ setups. The presented area corresponds to 90-mm-square area cut from 204.8-mm calculation matrix.