Withayachumnankul, W.Fujita, M.Nagatsuma, T.2018-09-052018-09-052018Advanced Optical Materials, 2018; 6(16):1800401-1-1800401-72195-10712195-1071http://hdl.handle.net/2440/114180Published online: June 25, 2018The terahertz frequency range locates between 0.1 and 10 THz. This range accommodates atmospheric windows with staggering absolute bandwidth. It holds a potential for point-to-point wireless communications with an aggregate capacity reaching terabit per second in a range up to a kilometer. This unique capability is envisaged for backhauls between base stations and for local area networks. To this end, efficiency and compactness of the transceivers are crucial for successful large-scale adoption. However, stateof- the-art terahertz front ends are based on radio-frequency or photomixing technologies that are inefficient, bulky, or complicated. In principle, as a neighbor of the microwave and optics domains, the terahertz band can leverage technologies from both sides to overcome those challenges. Recently, low-loss integrated circuits based on photonic crystal waveguides are developed for routing terahertz waves. Here, a progress report on core components, including waveguides and diplexers, is presented. Additionally, the interfacing of the platform with electronic sources and detectors on one end, and with antennas for free-space coupling on the other end, is discussed. Currently, the platform can support terahertz communications at a data rate over 10 Gbit s⁻¹. Challenges and opportunities are discussed in the light of future development in this area.en© 2018 The Authors. Published by WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.Antennas; diplexers; photonic crystal waveguides; terahertz; terahertz communicationsJournal article003009628110.1002/adom.2018004010004422075000192-s2.0-85051813463434847Withayachumnankul, W. [0000-0003-1155-567X]