The left panels show the photonic band structures of the conventional unit cells of the inverse gyroid structures withnc= 3 along the X direction (which corresponds to the H direction in the primitive unit cell). The color of the lines in both band structures reflects the circular dichroism index (C), where right-circularly polarized (RCP) is red, left-circularly polarized (LCP) is blue, and unpolarized is black, and their thickness is proportionate to the coupling constant(see Experimental Section). The right panels show the transmittance spectra for RCP (red) and LCP (blue) plane waves normally incident to a finite slab of the inverse gyroid crystals withnc= 3 along the [100] direction.
