Withayachumnankul, W.Yamada, R.Fujita, M.Nagatsuma, T.2019-01-132019-01-132018International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz, 2018, vol.2018-September97815386380952162-20272162-2035http://hdl.handle.net/2440/117204Integrated terahertz photonics has emerged as a viable option for routing and processing terahertz signals with high efficiency and broad bandwidth. This can be implemented by using photonic crystal waveguides entirely made of a float-zone intrinsic silicon slab that has exceptionally low loss for terahertz waves. A challenge presented here is to couple guided waves in this integrated platform with free-space waves. It is imperative that the coupling antennas must have low loss, high bandwidth, and high gain, and be integrated as a part of the platform. Here we present an evolution of antenna designs from a single dielectric rod to a rod array that can satisfy all these requirements. All these antennas are integrated onto the same silicon photonic crystal slab used for waveguiding.en©2018 IEEEConference paper003010518710.1109/IRMMW-THz.2018.85099060004496837000682-s2.0-85056902190451570Withayachumnankul, W. [0000-0003-1155-567X]