TERAOPTICS – is a European funded research network focusing on Terahertz Photonics for Communications, Space, Security, Radio-Astronomy, and Material Science. It comprises 11 academic and another 12 mostly non-academic industrial partners from around the globe. The focused session will present some of the recent scientific breakthroughs in photonic integrated circuit (PIC) development that have contributed to the advancement of the field. This includes high-power THz photodiodes integrated with ultra-wideband dielectric waveguides for spectroscopic applications, polymer-based hybrid THz PICs, novel photonic THz receiver based upon optically pumped mixers, and broadband and low phase noise radio frequency over fiver (RFoF) technology up to diffractive optics for THz beam control.