  This letter proposes a 50:50 TE terahertz (THz) power splitter based on
digitized metamaterials. The device is optimized using particle swarm
optimization algorithm. The structure of the digitized metamaterials contains
circular air holes in silicon slab which are deposited on silicon dioxide
substrate. The optimized structure shows insertion loss (IL) of less than 3.9
dB over the frequency range of 0.9-1.1 THz. The proposed device has the
footprint of 400 $\times$ 350 $\mu$m$^2$. The proposed device has excellent
merits such as compactness, efficient, all-dielectric, and compatible with CMOS
fabrication technologies. This device can be used as a vital component in most
of the THz circuits to route THz waves.
