Experimental modulation of extrinsic chirality. (a) Schematic illustration of extrinsic chirality by tilting the incident wave vector relative to the normal of the metamaterial surface. (b, c) Experimental incident angle dependent CD responses with clockwise and anticlockwise tilt by measuring the D-conformation. (d, e) Modulation of extrinsic chirality at mode I and mode II. Intrinsic and extrinsic chirality reveals the same geometrical origin, and intrinsic chirality can be compensated by the extrinsic one.