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Fig. 2
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(a) Experimental setup for THz modulation where 1 represents the semi-insulating Si wafer, 2 is the ITO-coated glass and 3 is the prejection lens. (b) Modulation types: uniform light with different gray scales (left), linear wire grids with varied orientations (middle) and a 4×4 reconfigurable aperture array (right). [38]