Fig. 9From: Chiral metamaterials: enhancement and control of optical activity and circular dichroismGyroid metamaterial. a, b Schematic unit cell of gyroid along the [100] and [110] directions [40]. Along each direction, there are two types of helical structures with different radii and chirality. Larger (smaller) helical structures are denoted by red (black) arrows. c SEM image of gold gyroid fabricated using block-copolymer self-assembly method [70]Back to article page